Devonian


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Related to Devonian: Permian, Devonian period, Carboniferous, Triassic, Silurian

Devonian

Geology of, denoting, or formed in the fourth period of the Palaeozoic era, between the Silurian and Carboniferous periods, lasting 60–70 million years during which amphibians first appeared

Devonian

[di′vō·nē·ən]
(geology)
The fourth period of the Paleozoic Era, covering the geological time span between about 412 and 354 × 106 years before present.
References in periodicals archive ?
The Devonian graptolites from the layers of rock samples CY-17, CY-18, CY-26, CY-27 and CY-29 mainly included Monograptus uniformis (Fig.
Apart from finds in Jordan, a Devonian light oil discovery made in the 1980s in southern Turkey is said to be sourced by these shales.
In the Devonian period, Waters explained, the world was experiencing super greenhouse climate conditions.
Palaeoscorpius devonicus Lehmann, 1944 from the Lower Devonian Hunsruck Slate Lagerstatte in Germany has also been re-investigated (Kuhl et al.
After 130 years of study focussed mainly on its fossil content, the remarkable window into an Early Devonian ecosystem thus revealed in the Campbellton Formation is now supported by a published record of the stratigraphy and synthesis of the paleoenvironment (Kennedy and Gibling 2011).
This outcrop was mapped as Upper Devonian Ohio Shale by Reidel (1975) and lies stratigraphically above (immediately downstream of) a Middle Silurian dolostone.
the Lower Devonian zone tested 1,144 (1,252(x)) boepd comprised of
In regional scale, the rocks of the Middle Devonian Narva Regional Stage are widespread in the East European Platform.
Exposures of the Middle Devonian Bell Shale at the abandoned Kelley's Island Lime and Transport Company Quarry near Rockport, Michigan, contain a moderately diverse and well-preserved invertebrate faunal assemblage.
Records at these sites suggested that the Late Devonian saw a prolonged drop in echinoderm diversity consistent with a mass extinction.
1967) were the first to recognize Lower Devonian rocks in the subsurface of Indiana, and Becker (1974) produced the first maps showing the distribution of these formations in the subsurface of southwestern Indiana.
Most workers recognize three major stratigraphic subdivisions of the subsurface Silurian and Lower Devonian in West Texas (Fig.