K-T extinction event
Across all continents.
Having restricted hydrologic circulation, leading to stagnant or anaerobic conditions. / (geology) Depleted in dissolved oxygen and containing dissolved hydrogen sulfide.
The rapid dying off of a large percentage of all animal species in a comparatively short period of time 65.5 million years ago. This coincides with the end of the Cretaceous period, and may have been caused by an impact event.
Any of various trees and shrubs of the genus Commidendrum.
化石記録は、白亜紀末の大量絶滅が非鳥類恐竜や多くの他の種を絶滅させたという説得力のある証拠を示している。
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