. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. STATUS OP INVERTEBRATE PALEONTOLOGY, 1953 195. Fig. 1. Eange in time of superfamilies of trilobites. Each black area varies in width in proportion to the number of genera recorded at any one time. Total number of genera in each superfamily is given. Data on Cambrian trilobites largely from Hupe (1953). Tremadoc is included in the Ordovician, and Lower, Middle, and Upper divisions of this period and of the Cambrian are indicated. Proportions of length of periods after Newell (1952). Correlations of strata and ranges of
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. STATUS OP INVERTEBRATE PALEONTOLOGY, 1953 195. Fig. 1. Eange in time of superfamilies of trilobites. Each black area varies in width in proportion to the number of genera recorded at any one time. Total number of genera in each superfamily is given. Data on Cambrian trilobites largely from Hupe (1953). Tremadoc is included in the Ordovician, and Lower, Middle, and Upper divisions of this period and of the Cambrian are indicated. Proportions of length of periods after Newell (1952). Correlations of strata and ranges of genera necessarily generalized. The Ptychoparioidae and allied superfamilies of the Cambrian are included in the more heavily stippled area, and post-Cambrian superfamilies possibly derived from them in the lighter, diagonally stippled Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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