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Middle Devonian Bentonite in Michigan Basin
AAPG Bulletin, 1974Abstract The name “Kawkawlin Bentonite” is proposed for a thin subsurface bentonitic dsh-fall bed in the Michigan basin Lucas Formation (upper Detroit River Group, Middle Devonian). Post-Detroit River emergence and erosion of the flanks of the basin resulted in truncation of the ash bed to its present limits.
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Tetrapod-like middle ear architecture in a Devonian fish
Nature, 2006Few fossils show the incipient stages of complex morphological transformations. For example, the earliest stages in the remodelling of the spiracular tract and suspensorium (jaw suspension) of osteolepiform fishes into the middle ear of tetrapods have remained elusive.
Martin D, Brazeau, Per E, Ahlberg
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Gastropods Of The Middle Devonian Anderdon Limestone.
1960PhD ; Geology ; University of Michigan, Horace H. Rackham School of Graduate Studies ; http://deepblue.lib.umich.edu/bitstream/2027.42/182794/2/6006900 ...
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Spores and the middle-upper Devonian boundary
Review of Palaeobotany and Palynology, 1981The stratigraphic levels most favoured for the Middle-Upper Devonian boundary fall approximately within the range of the ammonoid Pharciceras lunulicosta Zone, i.e. from the Middle varcus Subzone to the base of the Lower asymmetricus Zone of the conodont scale.
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Middle Devonian bone beds of Ohio
Geological Society of America Bulletin, 1944The Middle Devonian limestones of central Ohio consist of two formations, the Columbus (late Ulsterian) and the Delaware (early Erian). Within these are at least four thin bone beds: the First, 10 feet below the top of the Columbus in Franklin and southern Delaware counties, the Second, at the contact of the Columbus and the Delaware from Franklin ...
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Middle Devonian Sandstones Of The Michigan Basin.
1949PhD ; Geology ; University of Michigan, Horace H. Rackham School of Graduate Studies ; http://deepblue.lib.umich.edu/bitstream/2027.42/182855/2/0001509 ...
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The Fauna of the Middle Devonian Beauvais Sandstone of Missouri
Science, 1931C, Croneis, A D, Hoffman
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SILICATE WEATHERING AND MIDDLE DEVONIAN PALEOCLIMATE
Geological Society of America Abstracts with Programs, 2020Teresa D. Avila +3 more
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