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RESULTS OF SOME RECENT STATISTICAL INVESTIGATIONS OF INVERTEBRATE FOSSILS
Author(s) -
TRUEMAN A. E.
Publication year - 1930
Publication title -
biological reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.993
H-Index - 165
eISSN - 1469-185X
pISSN - 1464-7931
DOI - 10.1111/j.1469-185x.1930.tb00901.x
Subject(s) - biology , horizon , variation (astronomy) , homogeneous , evolutionary biology , range (aeronautics) , zoology , paleontology , mathematics , physics , geometry , materials science , combinatorics , astrophysics , composite material
Summary. Statistical investigations of Lamellibranchs and Gastropods show that there is considerable variation in any series collected at one horizon. The variation is greatest in such sedentary forms as Gryphaea and Carbonicola , but the variations appear to be similar in character, although they are not so wide in range, in certain Gastropods. At each horizon variation appears to be continuous, and the characters, on the whole, vary independently. Each community is apparently homogeneous and indivisible. It is suggested that such an evolving stock must be regarded as a “plexus” or bundle of anastomosing lineages.