Newell, Norman D. “Catastrophism and the fossil record.” Evolution 10, no. 1 (1956): 97-101.
URL1 URL2
Several stimulating contributions from the fertile pen of Otto H. Schindewolf of Tiibingen
University deal with the enigmatic, apparently world-wide, major interruptions in the fossil
record which mark the boundaries of the eras, largest divisions of geologic time (Schindewolf, 1950, 1953, 1954). Abrupt paleontological changes at these stratigraphic levels are real, approximately synchronous, and are recognizable at many places in different parts of
the earth where fossiliferous rocks of appropriate ages are represented and have been carefully examined