What happened in the 1860s?
🔬 The discovery of the Cretaceous-Paleogene extinction event layer by scientists (1860s research foundations)
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Further Reading
Cretaceous–Paleogene extinction event - Wikipedia (wikipedia.org)
The KT extinction - University of California Museum of Paleontology (berkeley.edu)
K–T extinction | Overview & Facts - Britannica (britannica.com)
Fossils show widespread plant extinctions after asteroid wiped out ... (psu.edu)
Deep Impact and the Mass Extinction of Species 65 Million Years Ago (nasa.gov)
Mass Extinction: What Happened 65 Million Years Ago? | AMNH (amnh.org)
PROCEEDINGS OF THE TENTH CONFERENCE ON ... - IRMA (nps.gov)
Cretaceous–Paleogene extinction event - AWS (amazonaws.com)
P 27 ABSTRACTS.p70 - GeoScienceWorld (geoscienceworld.org)
GEOL 104 The Cretaceous-Paleogene Extinction: All Good Things... (umd.edu)