The Calvin 28 cryptoexplosive disturbance, Cass County, Michigan: Evidence for impact origin [PDF]
The Calvin 28 cryptoexplosive disturbance is an isolated, nearly circular subsurface structure of Late Ordovician age in southwestern Michigan. The structure is defined by 107 wells, is about 7.24 km in diameter and consists of a central dome, an annular
Milstein, Randall L.
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Middle Ordovician-Upper Devonian natural reservoirs of the Pechora Sea shelf and adjacent Timan-Pechora oil and gas province [PDF]
, 2019 E.B. Rile, А. В. Ершов
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The first Silurian horseshoe crab reveals details of the xiphosuran ground plan. [PDF]
Proc Biol SciLamsdell JC.
europepmc +1 more source
SP-06 The Cryptostome Bryozoa from the Middle Ordovician Decorah Shale, Minnesota
, 1969 Olgerts L. Karklins
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Ordovician conodonts from the Bulltinden Formation, Motalafjella, central-western Spitsbergen
, 1986 Howard A. Armstrong +2 more
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Facies Patterns and Conodont Biogeography in Arctic Alaska and the Canadian Arctic Islands: Evidence against Juxtaposition of These Areas during Early Paleozoic Time [PDF]
, 2000 Bradley, D. C. +3 more
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Geochemical characteristic of different-lithofacies source rocks and its implications for ultradeep hydrocarbon exploration in the lower cambrian Yuertus formation, Tarim basin. [PDF]
Sci RepZeng Q +12 more
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The Cambrian and Ordovician Systems in the Pacific Area : (II)
, 1987 Teiichi KOBAYASHI
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Episodic body size variations of early Paleozoic trilobites associated with marine redox changes. [PDF]
Sci AdvSun Z, Zhao F, Zeng H, Erwin DH, Zhu M.
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Recognition of Shoaling Cycles in the Maquoketa Group (Upper Ordovician) of Southern Indiana
, 1992 ALAN SWENSON
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