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Contenta paginae descriptionis fasciculi subter monstrantur.
Summarium
DescriptioK-T-boundary.JPG
English: The intermediate claystone layer contains 1000 times more iridium than the upper and lower layers. It is the boundary between Cretaceous and Tertiary Periods. Picture taken by the author at San Diego Natural History Museum. The rock is from Wyoming, USA.
communicare – copiare, distribuere et committere hoc opus
to remix – to adapt the work
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((Information |Description=((en|1=The intermediate claystone layer contains 1000 times more iridium than the upper and lower layers. It is the boundary between Cretaceous and Tertiary Periods. Picture taken by the author at San Diego's Natural History Mus