Cretaceous-Tertiary boundary


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Cre`ta´ceous-Tert´i`ar`y boun´da`ry

    (krė`tā´shŭs)
n.1.a thin layer of geologic deposits, of varying thickness in different parts of the world, found between the geological strata identified as Cretaceous and the strata above, identified as Tertiary; also, the time point or period marking the boundary between the Cretaceous and Tertiary periods.
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The second bioevent is found at the Cretaceous-Tertiary boundary where these dinosaurs, mesoeucrocodiles and pterosaur became extinct and the mammals (also birds) became dominant.
The sharp change in depositional setting was possibly due to contemporaneous faulting associated with rifting around the Cretaceous-Tertiary boundary.
The layer, known as the Cretaceous-Tertiary boundary or the K-T boundary, is full of rare elements like Iridium and Quartz.
Definitely there was a change in population leading up to the Cretaceous-Tertiary boundary, so something was happening to the faunas prior to the impact," Goodwin said.
The Cretaceous-Tertiary boundary in the Iberian Peninsula marine record: meteoritic impact phases, diagenesis and paleoenvironmental effects deduced from rock magnetism
According to plant biologist and wine writer Jamie Goode, "The cork industry currently looks a bit like a dinosaur watching the meteor impact that occurred at the Cretaceous-Tertiary boundary 65 million years ago.
Activities of the conference started with a pre-conference field excursion to the Cretaceous-Tertiary boundary exposure at Agost, where participants were able to sample this classic K/T boundary section, and to the Hauterivian-Barremian section in Rio Argos, close to Caravaca.
The Cretaceous unit cropping out in the map area consists of the late Cretaceous Owl Creek Formation with the Cretaceous-Tertiary boundary forming the upper contact.
Testing extinction theories at the Cretaceous-Tertiary boundary using the vertebrate fossil record.
Upper Cretaceous rocks of the Kemp Clay containing abnormal foraminiferal faunas are present at Cretaceous-Tertiary boundary sections along the Brazos River in Falls County, Texas (Fig.
The discovery of extraterrestrial amino acids (135: 356) and the rare mineral stishovite (135: 132) in rocks from the Cretaceous-Tertiary Boundary provided further evidence that a large body collided with Earth 65 million years ago, causing the mass extinctions that occurred around that time.