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.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
The western Gaj river section, Pakistan, and the Cretaceous-Tertiary boundary. Micropaleontology, 178-193.
Unless not known to these authors, the Cretaceous-Tertiary boundary has not yet been established in this subregion from any outcrop section.
The sharp change in depositional setting was possibly due to contemporaneous faulting associated with rifting around the Cretaceous-Tertiary boundary. The slight change in dip and strike across the Simsima-Muthaymimah boundary is evidence of tectonic disturbance at the end of the Cretaceous.
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.
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 Owl Creek comprises the top of the Cretaceous section with the Cretaceous-Tertiary boundary as its upper contact; a basal sand marks its lower, unconformable contact with the Ripley Formation.
Testing extinction theories at the Cretaceous-Tertiary boundary using the vertebrate fossil record.