Middle Devonian


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Middle Devonian

[′mid·əl di′vō·nē·ən]
(geology)
The geologic epoch occurring between the Upper and Lower Devonian, beginning approximately 385,000,000 years ago.
References in periodicals archive ?
Lithostratigraphy, conodont biostratigraphy and depositional environment of the Middle Devonian (Givetian) to Early Carboniferous (Tournaisian) Lipak Formation in the Pin Valley (NW India).
The label NEW ALBANY shale was inserted in the middle of the list, followed by MIDDLE DEVONIAN and LOWER DEVONIAN, which are terms for geological time periods.
Peter Sandstone, the Utica Shale and related Collingwood Member, the Burnt Bluff Group, Silurian reefs in the Michigan Basin, Ray Reef, hydrocarbon source rocks, the Middle Devonian Sylvania Sandstone, the Devonian of South Buckeye field, the Marshall Formation, Mississippian and Pennsylvania strata, and Pennsylvanian red beds.
New late Silurian to Middle Devonian acanthodians of the Timan-Pechora region.
The residual bitumen stored in the famous Middle Devonian paleoreservoir of Dachang reef is estimated to be tens of millions of tons.
The potash deposits found in Saskatchewan are believed to have formed over 350 million years ago as a result of the final stage of evaporative concentration of sea water in a middle Devonian sea.
The three tectonic cycles of opening-closing for the western Qinling are Early Cambrian ~ Early Devonian, Middle Devonian ~ Late Carboniferous, and Early Permian ~ Late Triassic [27], while the two tectonic phases of opening-closing for eastern Qinling are Early Cambrian ~ Late Silurian and Early Devonian ~ Late Triassic [26].
They cover the lower Silurian of western Ohio; Bourbon and springs in the Inner Bluegrass region of Kentucky; temporal and spatial scales of stream study in west-central Ohio; the golden Ordovician, Silurian seas, and Pleistocene ice; downtown and the Great Dayton Flood of 1913; and fossil collecting from the Middle Devonian silica formation in Paulding County.
This USGS assessment is an estimate of continuous gas and natural gas liquid accumulations in the Middle Devonian Marcellus Shale of the Appalachian Basin.
"The Middle Devonian plants with wood are shrubs or trees of very small stature.
Q I found this interesting fossil while splitting Middle Devonian limestone at Hungry Hollow, Ontario.
ABSTRACT: Mid- to outer shelf (= offshore) marine deposits of hemipelagic dark-gray mudstone comprising the Mahantango Formation (Middle Devonian), Pike County, Pennsylvania, have yielded an assemblage of trace fossils.