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all geography including DSDP/ODP Sites and Legs
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North America
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Basin and Range Province (1)
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lower Paleozoic
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Cape Phillips Formation (1)
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Black River Group (1)
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Galena Dolomite (1)
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Upper Ordovician (1)
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Peel Sound Formation (3)
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Silurian
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Upper Silurian
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Bloomsburg Formation (1)
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Ludlow (2)
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United States
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Colorado
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Agnatha
A reappraisal of Nemavermes mackeei from the Mazon Creek fossil site expands Carboniferous cyclostome diversity Open Access
Ontogeny of Euphanerops longaevus from the Upper Devonian Miguasha Fossil–Fish–Lagerstätte and comparison with the skeletogenesis of the sea lamprey Petromyzon marinus Available to Purchase
RAEDERICHNUS DONDASI A NEW TRACE FOSSIL FROM THE EARLY PALEOZOIC OF ARGENTINA REVEALS SHOALING BEHAVIOR IN EARLY FISH Available to Purchase
Evaluating Devonian bioregionalization: quantifying biogeographic areas Available to Purchase
The Boothiaspidinae, a new agnathan subfamily (Heterostraci, Cyathaspididae) from the late Silurian and Early Devonian of the western United States and the Canadian Arctic Available to Purchase
A new Tolypelepidid (Agnatha, Heterostraci) from the Late Silurian of Poland Available to Purchase
A new species of osteostracan from the Lochkovian (Early Devonian) of the Mackenzie Mountains, with comments on body size, growth, and geographic distribution in the genus Machairaspis Available to Purchase
Colorado geology then and now: Following the route of the Colorado Scientific Society’s 1901 trip through central Colorado Available to Purchase
Abstract In 1901, Charles Van Hise asked Samuel Emmons and Whitman Cross to organize a grand excursion across Colorado as part of the combined meeting of the American Association for the Advancement of Science, GSA, and the Colorado Scientific Society (CSS). This trip replays part of that 10-day excursion across Colorado. Shortened to three days, this trip takes in some of the same sites as the 1901 trip, plus adds others of interest along the route where CSS members are reinventing geological interpretations. The trip will follow the precedent set in 1901; CSS members will serve as “site or stop hosts” in addition to the trip leader and drivers. While walking in the steps of the most famous of our profession we will also see some of the most magnificent scenery of Colorado.
The biota, depositional environment and age of the Old Red Sandstone of the island of Kerrera, Scotland Available to Purchase
Ordovician vertebrate habitats: A Gondwanan perspective Available to Purchase
Eramosa Lagerstätte—Exceptionally preserved soft-bodied biotas with shallow-marine shelly and bioturbating organisms (Silurian, Ontario, Canada) Available to Purchase
Upper Triassic continental margin strata of the central Alaska Range: Implications for paleogeographic reconstruction Available to Purchase
Remnants of a Late Triassic continental margin and ocean basin are scattered across central and southern Alaska. Little is known about the fundamental nature of the margin because most remnants have not been studied in detail and a protracted period of terrane accretion and margin-parallel translation has disrupted original stratigraphic and structural relationships. Three new conodont collections were recovered from a sequence of Upper Triassic calcareous sedimentary rocks in the central Alaska Range. One of the three localities is north of the Denali fault system in an area previously thought to be underlain by an uninterrupted sequence of metamorphic rocks of the parautochthonous Yukon-Tanana terrane. Structural relations in the immediate vicinity of this conodont locality indicate that mid-Cretaceous(?) thrust faulting imbricated Paleozoic metaigneous rocks with the Triassic sedimentary rocks. This may reflect a closer pre-Cretaceous relationship between the Yukon-Tanana terrane and Late Triassic shelf and slope deposits than previously appreciated. Reexamination of existing conodont collections from the central Alaska Range indicates that Upper Triassic marine slope and basin rocks range in age from at least as old as the late Carnian to the early middle Norian. The conodont assemblages typical of these rocks are generally cosmopolitan and do not define a distinct paleogeographic faunal realm. One collection, however, contains Epigondolella multidentata sensu Orchard 1991c , which appears to be restricted to western North American autochthonous rocks. Although paleogeographic relations cannot be determined with specificity, the present distribution of biofaces within the Upper Triassic sequence could not have been the result of simple accordion-style collapse of the Late Triassic margin.