Middle Cretaceous


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Related to Middle Cretaceous: Middle Cambrian, Middle Jurassic, Middle Triassic

Middle Cretaceous

[′mid·əl krə′tā·shəs]
(geology)
The geologic epoch between the Upper and Lower Cretaceous, beginning approximately 120,000,000 years ago.
References in periodicals archive ?
Heretofore, five valid lungfish species were known from the Late Jurassic to middle Cretaceous of the North American Western Interior (Kirkland 1987; 1998).
Additional production is possible from the Upper Cretaceous Shiranish limestone (27[degrees] API oil) and the Middle Cretaceous Qamchuqa limestone.
A paucity of large theropod taxa from the middle Cretaceous of North America and Europe severely hampers a detailed assessment of biogeography of this age.
Unfortunately for paleontologists, this relatively sudden evolutionary shift took place during a 15-million-year Middle Cretaceous period that's poorly represented in the fossil record.
Ishida provide a review of the Early and Middle Cretaceous Iguanodonts and their global distribution; S.D.
The Thamama is succeeded by the Middle Cretaceous Wasia Group consisting, in ascending order, of the Nahr Umr, the Mauddud and the Salabekh (or Shilaif) and its partial lateral equivalent, the Mishref.
It has similar Lower and Middle Cretaceous (L&MC) Fms.
(MPC), has produced since 1955 from Cretaceous carbonates: the fractured Shiranish marly limestone of the Maestrichtian/ Campanian (Upper Cretaceous) age where 32[degrees] API, 3% sulphur oil has been depleting; and the Middle Cretaceous Qamchuqa Fm (29[degrees] API oil, 2.6% S).
It has produced from the Middle Cretaceous Wara and Nahr Umr sandstones, mostly 31.7 deg.
It also has oil accumulations in an Upper Cretaceous fractured Shiranish limestone and a Middle Cretaceous Qamchuqa limestone.
A naturally fractured field, Fahud has Lower and Middle Cretaceous Fms.
(AOC) of Japan, is a 10x7 km field containing sour oil and over 35 TCF of non-associated gas from a Middle Cretaceous formation.