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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 Subsurface Formations in Illinois
AAPG Bulletin, 1944The underground extent in Illinois of Middle Devonian beds is outlined, and formation names are suggested for use in subsurface work. The Grand Tower limestone and Dutch Creek sandstone are together considered the equivalent of the Geneva dolomite. Limits of the sequence of Hamilton age in Illinois are defined, and the probable distribution of the ...
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Stratigraphy and Facies Across Lower Devonian-Middle Devonian Boundary, Central Nevada
AAPG Bulletin, 1983A regressive episode near the end of the Early Devonian caused a nearshore quartzose carbonate facies to shift to the edge of the carbonate shelf in central Nevada. Transgression followed in the latest Early Devonian and continued in the early Middle Devonian.
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Middle Devonian Muskeg Evaporites of Western Canada
AAPG Bulletin, 1969The Muskeg Formation, as established by J. Law in 1955, is a complex of intricately interbedded and interfingering carbonate and evaporite rocks, with interspersed insoluble residual beds. The complex can be divided into several time-stratigraphic entities, which indicate a consistent upward increase in salinity. The vertical succession is consistently
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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 Stratigraphy of Northeastern Spanish Sahara
AAPG Bulletin, 1964In support of petroleum exploration, four stratigraphic sections were measured and described in the Middle Devonian outcrop area of northeastern Spanish Sahara. These sediments are exposed in an east-west belt along the south flank of the Tindouf basin.
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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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Middle Devonian Sandstones Of The Michigan Basin.
1950PhD ; 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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