Antler orogeny

The Antler Orogeny Mystery: The Antler orogeny is a bit of a puzzle for geologists, as the small orogeny has several possible causes, including a collision between the North American plate and an island arc. However, evidence exists that the cause could be a meteor impact. Answer and Explanation: 1

Pre-Extensional History Neoproterozoic to Devonian: Thick section of marine sedimentary rocks deposited on continental shelf Mississippian Antler orogeny and Permian-Triassic Sonoma orogeny thrust deep marine rocks over the shelf.With the Caledonian orogeny completed Laurussia was delimited thus: The eastern margin were the Barents Shelf and Moscow Platform; the western margin were the western shelves of Laurentia, later affected by the Antler orogeny; the northern margin was the Innuitian-Lomonosov orogeny which marked the collision between Laurussia and the Arctic Craton;Cordilleran orogenic systems are long belts of deformation and magmatism that form when oceanic plates subduct beneath continental ones. Links between processes in the upper continental plate ...Earliest Carboniferous cooling step triggered by the Antler orogeny? Matthew R. Saltzman* Department of Geoscience, University of Iowa, Iowa City, Iowa 52242, USA Luis A. González Kyger C Lohmann Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48104, USA ABSTRACT the main episodes of glaciation in the Late Ordovician and middle Carbonif- We report a large ... Created Date: 5/6/2008 4:51:37 PMAntler orogeny. a Late Devonian to Mississippian episode of mountain building that affected the Cordilleran mobile belt; was caused by subduction, resulting in deep water deposits and oceanic crustal rocks being thrust eastward over shallow water continental shelf sediments, thus closing the narrow ocean basin that seperated the island arc from ...the Antler foredeep and continental shelf (fig. 9). To the west, eugeosynclinal sediments consisting of fine-grained, siliceous, clastic rocks, chert, and local basalt (western assemblage) were also deposited in the early Paleozoic (figs. 9 and 10). The Antler orogeny, a Mediterranean type orogeny, took place during

Cordilleran Mobile Belt Antler Orogeny in Devonian. Cordillera Evolved • After Laramide deformation, Cordillera continued to evolve • large-scale block-faulting • extensive volcanism • vertical uplift and deep erosion • Basin and Range • During about the first half of the Cenozoic Era, ...Idaho has mostly marine deposits with coral reef faunas well represented. Coarse-grained, distinctive, continentally-derived sediments with associated plant fossils show up in Idaho for the first time during the Mississippian period as a result of the Antler Orogeny.Individual Cordilleran orogenic pulses are defined as the Antler orogeny (∼380-340 Ma), Sonoma (∼270-240 Ma), Nevadan (∼180-140 Ma), Sevier (140-50 Ma), Laramide (70-35 Ma) and the ongoing Cascade and Andean orogenies. Similar to the Appalachian orogenic cycle, the Cordilleran cycle has involved the collision of volcanic arcs ...Sevier orogeny, a mountain-building event that produced the Sevier Orogenic Belt, a linear zone of deformed rock strata in the western United States extending from southeastern California northeastward through southern Nevada and western Utah to western Wyoming. The deformation took place between 165 million and 80 million years ago during the Jurassic and Cretaceous periods.The Antler Orogeny. More than 300 million years ago, continental tectonics pushed large blocks of the earth’s crust eastward across today’s Basin and Range [a physiographic region of the western and southwestern part of the United States that includes portions of California, Arizona, Mexico, and nearly all of Nevada]The Antler orogeny was a tectonic event that began in the early Late Devonian with widespread effects continuing into the Mississippian and early Pennsylvanian. Most of the evidence for this event is in Nevada but the limits of its reach are unknown. A great volume of conglomeratic deposits of mainly Mississippian age in Nevada and adjacent areas testifies to the existence of an important ...Acadian orogeny and Antler orogeny. Which orogeny is not related to the gradual closing of the Iapetus Ocean or the Tethys by subduction? Antler. T/F. Coal deposition in the Pennsylvanian has been linked to glacial advances and retreats on Gondwana. True.The Late Devonian was a time of continental plate convergence, with enhanced regional subduction-related arc volcanism and large-scale mountain building, such as the Antler orogeny in western Laurentia, the Ellesmerian orogeny in northern Laurentia, the Appalachian orogeny in eastern Laurentia, the Variscan orogeny in …

Acadian orogeny, a mountain-building event that affected an area from present-day New York to Newfoundland during the Devonian Period (416 to 359.2 million years ago). Originally a depositional fore-arc basin formed from what was formerly known as the Appalachian Geosyncline; subsequent.The Antler orogeny resulted from late Middle Mississippian sinistral-oblique convergence at this step. Continuing oblique convergence produced the subsequent late Paleozoic basins, structures, and ...During the Mississippian period (around 340 million years ago), an island arc collided with and accreted to that coast, generating a major mountain-building event: the Antler Orogeny (Figure 1.10). This orogeny was the first in a long series of mountain-building events that affected the margin of western North America.Antler Orogeny . Late Devonian and Mississippian episode of mountain building involving folding and thrusting along a belt across Nevada to southwestern Alberta. Avalon Terrane . A displaced continental fragment that had collided with the Appalachians before Devonian. Caledonian Orogeny .Study with Quizlet and memorize flashcards containing terms like Throughout most of the early Paleozoic, North America A. straddled the equator B. was north of the equator C. was south of the equator, The Sauk transgression first deposited _______ across the craton. A. Sands B. Shale C. Limestone, The Taconic orogeny began in the southern Appalachian area. A. True B. False and more.

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Earth Sciences questions and answers. 1) The west coast experiences the Antler Orogeny. This is the collision of a volcanic island arc. Explain what this is, and in 2 simple cross-sections draw how the continental margin looked (a) just prior to collision, and (b) during collision.Antler Orogeny. The Iapetus ocean formed during Early Paleozoic as a response to the rifting of Pangea. False. What two orogenies during Late Paleozoic brought North America and Europe together as a combined land mass? Caledonian and Acadian. During Early Paleozoic, there were four large continents.Deer incorporate both physical and behavioral adaptations for survival. Physical adaptations are in their fur, senses, antlers, hooves and stomachs. Deer also exhibit behavioral adaptations in communication.Taconic orogeny, first of three mountain-building events forming the Appalachian Mountains in eastern North America, the Acadian and Alleghenian orogenies being the second and third events, respectively. Originally viewed as a single event, the Taconic orogeny is now known to consist of at leastThe Antler orogeny occurred in Mississippian time at a passive margin of the sialic North American continent in Nevada and probably in Idaho. Its principal events were the emplacement of an ...

The enigmatic Antler orogeny occurred in the Devonian and Carboniferous, but the cause and extent of it are disputed. That was followed by the even more controversial Sonoma …Instead, the orogeny was characterized by appearance of an elongate north-northeast-trending uplift through central Nevada and by two parallel flanking depressions. The eastern depression was the Antler foreland trough, into which sediments flowed from both east and west in the Mississippian.This structural relationship, subsequently mapped in other mountain ranges, is the primary record of the Late Devonian to Early Mississippian Antler Orogeny, the first major orogenic event to affect the Cordilleran margin of Laurentia in the Paleozoic.Following the Antler orogeny, uplifted parts of the arc, forearc, and accretionary prism (Roberts Mountains allochthon) eroded, cooled, subsided, and were buried as the new continental margin regained isostatic equilibrium (Dickinson, 1981a,b, 2000; Speed and Sleep, 1982; Ingersoll, 1997) (Fig. 4 C and D). A possible young analog for the Antler Orogeny. Caption: A possible young analog for the Antler Orogeny. Credit: Image courtesy of Professor Burchfiel. Course Info Instructors Ben Crosby; Prof. B. Clark Burchfiel; Departments Earth, Atmospheric, and Planetary Sciences; As Taught In ...Antoloji örnekleri şunlardır: - Mehmet Fuat Köprülü: Divan Edebiyatı Antolojisi. - Asım Bezirci: Dünden Bugüne Türk Şiiri. - Rauf Mutluay: Tanzimattan …Mississippian Antler orogeny. We interpret the juxtaposition of basinal rocks and miogeoclinal rocks in the Northern Ritter Range pendant to in-dicate the southwestern limit of the Antler oro-genic belt in the east-central Sierra Nevada. PALEOZOIC STRATIGRAPHY Previous studies grouped all Paleozoic metasedimentary rocks in the Northern RitterAs used here, the term Antler orogeny signifies only re-gional uplift along the outer miogeocline; it does not imply folding and thrust faulting. Ironically, the tec-tonic event in the vicinity of Antler Peak that is cele-brated as the type occurrence of the Late Devon-ian-Early Mississippian Antler orogeny is probably of Middle Pennsylvanian ...During the Proterozoic, we can find two examples of Precambrian rock in the Grand Canyon. What is the name of the younger rock. Grand Canyon Supergroup. Inland seas that cover continents are called: epicontinental seaways. The Grenville orogeny is associated with the formation of: (supercontinent) Rodinia.

Abstract. We report a large, positive, carbon isotope excursion in the Kinderhookian Stage of the Lower Mississippian in North America and propose that the excursion is linked to the Antler orogeny. The δ 13 C excursion reaches +7.1‰ in the upper part of the Joana Limestone in southeast Nevada and correlates with peaks recognized in Europe ...

the onset of the Antler Orogeny [e.g., Poole et al., 1992; Dickinson, 2006]. Late Devonian to Pennsylvanian strata of east-central Nevada were deposited in basins associated with the Antler orogeny (e.g., Antler foreland basin) and other late Paleozoic deformation [e.g., Trexler et al., 2004]. The overall thickness ofThe Antler orogeny is a bit of a puzzle for geologists, as the small orogeny has several possible causes, including a collision between the North American plate and an island arc. However, evidence exists that the cause could be a …Individual Cordilleran orogenic pulses are defined as the Antler orogeny (∼380-340 Ma), Sonoma (∼270-240 Ma), Nevadan (∼180-140 Ma), Sevier (140-50 Ma), Laramide (70-35 Ma) and the ongoing Cascade and Andean orogenies. Similar to the Appalachian orogenic cycle, the Cordilleran cycle has involved the collision of volcanic arcs ...Mississippian Subperiod, first major subdivision of the Carboniferous Period, lasting from 358.9 to 323.2 million years ago.The Mississippian is characterized by shallow-water limestone deposits occupying the interiors of continents, especially in the Northern Hemisphere. These limestones exhibit a change from calcite-dominated grains and cements to aragonite-dominated ones.The Antler orogeny. What were some of the ways in which the therapsids are thought to have been adaptively superior to the amphibians and reptiles that preceded them? (Select all that apply.) ~They may have been endothermic. ~Their legs were positioned more directly beneath their bodies.A. Antler orogeny. B. Alleghanian orogeny. C. Himalayan orogeny. D. Sevier orogeny. Expert Answer. Who are the experts? Experts are tested by Chegg as specialists in their subject area. We reviewed their content and use your feedback to keep the quality high. Step 1. The Appal... View the full answer.66. Rodgers J (1971) The Taconic Orogeny. Geol Soc Am Bull 82:1141–1178. 68. McKerrow WS, Mac Niocaill C, Dewey JF (2000) The Caledonian orogeny redefined. J Geol Soc London 157:1149–1154. 71. Speed RC, Sleep NH (1982) Antler orogeny and foreland basin: A model. Geol Soc Am Bull 93:815–828. 72. The Laramide orogeny is different from the Sevier orogeny due to the angle of subduction of the tectonic plates colliding with the North American Plate.

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During the Antler orogeny, deep-water siliciclastic rocks (western assemblage) were thrust eastward over coeval shelf- and slope-facies marine rocks (eastern assemblage) along the Roberts Mountains thrust . A thick, clastic wedge was deposited in front of the thrust belt (Burchfiel et al., 1992). ...Pre-Extensional History Neoproterozoic to Devonian: Thick section of marine sedimentary rocks deposited on continental shelf Mississippian Antler orogeny and Permian-Triassic Sonoma orogeny thrust deep marine rocks over the shelf.The collision between Laurentia and Balonia (Baltica + Avalonia) that resulted in the closure of the Iapetus Ocean, the Caledonide orogeny and the formation of Laurussia (Fig. 1) began in the Silurian, but protracted orogenesis along the proto-Appalachian margin continued into the Devonian.Following the locally-defined Silurian Salinic orogeny, the …The Antler orogeny has uplifted the RMA strata into a highland on the western Laurentian margin. Figure 12. View large Download slide. Paleogeographic maps of Laurentia from Middle Ordovician through Mississippian time (Blakey, 2013). Stars represent the depositional basin of Roberts Mountains allochthon (RMA) strata. White lines show the ...Legend says that jackalopes roam the plains of Wyoming and even like to sing campfire songs. How much truth is there to this mythical creature? Advertisement Every few years, the Wyoming Legislature debates a hot-button issue: Should the ja...The Antler orogeny is a textbook example of a Paleozoic mountain building and crustal shortening event in western North America. A relatively complex geologic history of the type Antler at Battle Mountain, Nevada, is interpreted as distinct thrust plates of Lower Cambrian Scott Canyon Formation, Upper Cambrian Harmony Sandstone, and Ordovician ...Sonoma orogeny) (Roberts and others, 1958; Burchfiel and Davis, 1972, 1975; Silberling, 1973). Starting in the Late Triassic and culminating in the Cretaceous, large granitic bodies were emplaced in western Nevada and locally elsewhere in Nevada. During the Sevier orogeny in the Cretaceous, major thrust faults developed inThree Devonian pulses of the Antler orogeny are better documented in the chapter on the Bisoni-McKay area. Here, the first Antler pulse in latest Middle Devonian time is obscured within an ~9 m.y. hiatus enlarged by excavation of the Alamo impact crater. The second Antler pulse is recorded by the ~4 m.y. hiatus produced by the regional ...Antler Orogeny (W) Silurian. Ordovician. Taconic Orogeny* (NE) Cambrian. Appalachian Provinces 4 Tectonic provinces are identified . 1) Plateaus (undeformed) 2) Valley and ridge (folded/faulted) 3) Piedmont (Highly metamorphosed) 4) Blue Ridge (igneous intrusions) Appalachian ProvincesThe Antler orogeny was not characterized by obduction of the Roberts Mountains allochthon; rocks composing the “allochthon” essentially were deposited in situ. Instead, the orogeny was characterized by appearance of an elongate north-northeast-trending uplift through central Nevada and by two parallel flanking depressions. ….

Study with Quizlet and memorize flashcards containing terms like Evaporites were deposited in restricted basins during the _____ regression, The Taconic orogeny occurred during the, In evaporite basins, salts accumulate because of rising, dense brines. and more.The enigmatic Antler orogeny occurred in the Devonian and Carboniferous, but the cause and extent of it are disputed. That was followed by the even more controversial Sonoma orogeny which may have occurred as late as the early Triassic.Question options: The Earth spinning faster and having shorter days Stronger tidal effects due to the moon being closer Frequent impact events No vascular plants to absorb solar radiation Question 10 How was the Antler orogeny different from other early North American orogenies?Multi-chronometer Bayesian time-temperature inversions suggest: (a) Cooling between ∼1.90 and ∼1.80 Ga, likely related to Big Sky orogeny thermal effects; (b) Reheating between ∼1.80 Ga and ∼1.35 Ga consistent with Mesoproterozoic burial; (c) Cooling to ≤100°C between Mesoproterozoic and early Paleozoic time, likely reflecting …Question options: The Earth spinning faster and having shorter days Stronger tidal effects due to the moon being closer Frequent impact events No vascular plants to absorb solar radiation Question 10 How was the Antler orogeny different from other early North American orogenies?Similar to that of the Antler Orogeny, but accreted a much larger portion of crust to North America. Late Permian to Triassic. Sevier Orogeny. The eastward shift in subduction associated with the Sevier Orogeny led to the formation of another foreland basin; the immense Cretaceous Interior Seaway ultimately developed in this basin. Cretaceous.In this lecture we return to the Late Devonian/ Early Mississippian to discuss the Antler Orogeny. In this image we see the sheared and folded deep water sediments of the distal Antler marine basin thrust over and emplaced on top of the shallow water deposits of the continental margin. It is uncertain how and why these deep water sediments were thrust up and over the continental edge extending ...The Antler orogeny was not characterized by obduction of the Roberts Mountains allochthon; rocks composing the "allochthon" essentially were deposited in situ. Instead, the orogeny was characterized by appearance of an elongate north-northeast- trending uplift through central Nevada and by two parallel flanking depressions.The Antler Orogeny and the First Suspect Terrane: Middle Devonian to Late Pennsylvanian: Ca. 400-300 Ma. DOI: Authors: Ronald C. Blakey. Wayne Ranney. Independent. Abstract and Figures. Antler orogeny, Newly recognized thrust faults that imbricate the Antler and Sonoma rocks and younger metamorphic rocks are of Late Triassic age and are cut by a 219 Ma pluton. These thrusts apparently were active during a major episode of Late Triassic arc volcanism, and they constrain the age of the Golconda thrust as pre-latest Triassic., Antler Orogeny. The Iapetus ocean formed during Early Paleozoic as a response to the rifting of Pangea. False. What two orogenies during Late Paleozoic brought North America and Europe together as a combined land mass? Caledonian and Acadian. During Early Paleozoic, there were four large continents., Sonoma orogeny was originally recognized (Silberling et al., 1962). Therefore, the contact between the Lower Inskip Formation and the Valmy Formation is interpreted to be a portion of the Golconda Thrust, which is considered the basal thrust of the Sonoma orogeny., Various plate-tectonic models have been suggested for the Antler orogeny and considerable debate has focused on the Antler magmatic arc that plays a role in virtually all of them. Some have argued that the Antler arc subsided after collision with the western North American continental margin and was subsequently buried by younger rocks of later ..., Previously, late Paleozoic deformation of the Antler orogen has been referred to as the Humboldt orogeny (Ketner, 1977), and the Humboldt orogeny was envisioned mainly as including late Paleozoic epeirogenic uplift, as well as depression of a number of basins widespread throughout the Cordillera (Snyder and others, 2000)., Paleontology and deposition of the Phosphoria Formation. Bruce R. Wardlaw; James W. Collinson. Author and Article Information. Rocky Mountain Geology (1986) 24 (2): 107-142. Article history. Cite. Share., The cause of the Taconian Orogeny was a collision between two tectonic plates: the ancestral North American plate’s continental leading edge, and another plate of oceanic affinity, now deceased. The oceanic plate was one of the plates that floored the Iapetus Ocean, and as it moved toward the ancestral North American plate, the oceanic ..., Antler Orogeny . Period: North America. Permian: Alleghenian Orogeny* (SE) Pensylvannian. Mississippian. Ouachita Orogeny (S) Devonian. Acadian Orogeny* (E) Antler ... , A. Antler orogeny. B. Alleghanian orogeny. C. Himalayan orogeny. D. Sevier orogeny. Expert Answer. Who are the experts? Experts are tested by Chegg as specialists in their subject area. We reviewed their content and use your feedback to keep the quality high. Step 1. The Appal... View the full answer., Deer velvet covers the bone and cartilage that grows into antlers. People have tried deer velvet for many reasons, but with no evidence to support its use. There is interest in using deer velvet for a number of purposes, but there isn't eno..., These are interpreted as early manifestations of the Antler Orogeny, which is well documented in the western United States. Middle Devonian foreland basin strata include the Mount Forster Formation and correlative strata, which change laterally from > 500 m of lithic sandstones, conglomerates and volcanic flows in westernmost exposures to ..., The Antler orogeny was a volcanic island arc that was accreted onto western North America with the subduction direction away from North America. This created a mountain range on the west coast of North American called the Antler highlands and was the first part of building the land in the west that would eventually make most of California ..., The Antler orogeny occurred in Mississippian time at a passive margin of the sialic North American continent in Nevada and probably in Idaho. Its principal events were the emplacement of an extensive allochthon of oceanic rocks on the continental shelf, subsidence of an elongate foreland basin, and maintenance of highlands in the interior region of the allochthon during and after subsidence of ..., pre-Mississippian Antler orogeny, this is not quite certain. The fault on which it probably rode, while perhaps contemporaneous with the Roberts thrust, is structurally much higher, within the upper plate of that thrust. In the type locality (7) in the Roberts Moun­ tains (fig. 1) and for SO miles tothe west, the Roberts, Abstract. A great volume of Mississippian orogenic deposits supports the concept of a mid-Paleozoic orogeny in Nevada, and the existence and timing of that event are not …, Study with Quizlet and memorize flashcards containing terms like The rise of sea level during the Cretaceous was apparently related to the expansion of the ocean crust caused by accelerated rifting. True False, These mineral deposits were formed at great depths and brought to the surface during explosive volcanism during the Cretaceous Period: carnotites copper diamonds garnets gold, Coal ..., Description . Near Bowman Lake, the greenschist facies Carboniferous Peale chert forms a moderately E-dipping, NW-trending homocline that is the record of the transition from the Devonian and Early Mississippian Antler Orogeny to the Permian and Triassic Sonoman Orogeny. , Antler Orogeny. Collisional tectonic event that impacted the passive western margin of Laurentia. clastic wedges. provide evidence for orogenic events. ... Alleghenian Orogeny. Mountain-building event that occurred when the part of Gondwana that is now Africa began to collide with Laurasia during the Late Pennsylvanian., formed, likely during the Antler Orogeny, prior to the deposi-tion of the Pennsylvanian-Permian Etchart Formation. Basalt, ... Triassic Sonoma Orogeny. Broad, northeast-trending folds in theEtchartareinterpreted to haveoccurred during theSonoma …, They pro- tically high value. posed that this isotopic anomaly might correlate with the Antler Only in the thick, mostly pelitic, foredeep deposits of the Dale orogeny, development of the Antler foreland, and sequestration of or- Canyon Formation, which forms the bulk of the Diamond Range se- ganic carbon in the sedimentary fill of this foreland., This next image portrays the timing of different depositional events around the time of the Antler Orogeny. You can see that the Arc Volcanism continued throughout the time that the Antler was created. You can also see that the sediment found in the Antler Allochthon were experiencing active deposition until ~360ma. The filling of the foredeep then starts ~355ma, suggesting that the material ..., Antler orogeny. The Late Devonian mountain-building event in which slices of deep-marine strata were pushed eastward, up and over the shallow-water strata on the western coast of North America. banded-iron formation (BIF) Iron-rich sedimentary layers consisting of alternating gray beds of iron oxide and red beds of iron-rich chert., Antler Orogeny . Period: North America. Permian: Alleghenian Orogeny* (SE) Pensylvannian. Mississippian. Ouachita Orogeny (S) Devonian. Acadian Orogeny* (E) Antler ... , They propose a two-phase history for the antler orogeny: (1) collision of the western edge of North America with the Antler allochthon and downwarping of the continental margin (360-350 Ma), which resulted in deposition of the Diamond Range submarine-fan system; and (2) uplift and low-amplitude folding of the basin (350-320 Ma), accompanied by ..., PowerPoint Presentation. Intro Plate Tectonic Setting Components of Cordilleran Orogenic Belt Major Components of the Cordilleran Retroarc Thrust belt Purpose Synthesize the major structural features and kinematic history of the Cordilleran orogenic belt. Assess paleogeographic development in the context of the evolution of the Cordilleran ..., The Antler Orogeny continued into Mississippian and Pennsylvanian. Late Paleozoic Orogenies of western North America. A volcanic island arc collided with the ..., Earliest Carboniferous cooling step triggered by the Antler orogeny? Matthew R. Saltzman* Department of Geoscience, University of Iowa, Iowa City, Iowa 52242, USA Luis A. González Kyger C Lohmann Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48104, USA ABSTRACT the main episodes of glaciation in the Late Ordovician and middle Carbonif- We report a large ... , The Late Devonian-Early Carboniferous (DC) Antler orogeny in southwestern Laurentia is contemporaneous with influx of clastic sediments, unconformities, and volcanism across much of western ..., Mississippian rocks of the Antler foreland basin in Nevada (western United States) record its evolution in detail, clarifying the timing and tectonic significance of the Antler orogeny. Synorogenic clastic sediments mark the initiation of tectonism; they arrived in Nevada from the north or northwest in late Early Mississippian (Osagean)., The Antler orogeny occurred in Mississippian time at a passive margin of the sialic North American continent in Nevada and probably in Idaho. Its principal events were the emplacement of an extensive allochthon of oceanic rocks on the continental shelf, subsidence of an elongate foreland basin, and maintenance of highlands in the interior region of the allochthon during and after subsidence of ... , The Antler Orogeny and the First Suspect Terrane: Middle Devonian to Late Pennsylvanian: Ca. 400-300 Ma. DOI: Authors: Ronald C. Blakey. Wayne Ranney. Independent. Abstract and Figures., Nevadan orogeny. The Nevadan orogeny occurred along the western margin of North America during the Middle Jurassic to Early Cretaceous time which is approximately from 155 Ma to 145 Ma. [1] Throughout the duration of this orogeny there were at least two different kinds of orogenic processes occurring. During the early stages of orogenesis an ..., Ketner, K.B., 2013, Stratigraphy of lower to middle Paleozoic rocks of northern Nevada and the Antler orogeny: U.S. Geological Survey Professional Paper 1799, 23 p., https://pubs.usgs.gov/pp/1799/. Contents. Abstract. Introduction. Sea-Level Rise in the Early Paleozoic. The Stratigraphic Sequence. Middle Ordovician Bioherm of the Adobe Range.