. Bulletins of American paleontology. Cheilostome Bryozoa: Cheetham et al. 167. 10 5 Time interval (Ma) Text-figure 2.—Temporal distribution of 204 PPP and 124 DR collections, the abundance of bryozoan specimens (total 60,757; see text for counting method), and the numbers of species (total 250) represented in each interval. Ages of collections are medians of ranges; collections are grouped in "bins" ending in whole units, Ma. a more detailed classification such as that of Hageman et al. (1998), for two reasons. First, the great majority of species, 67%, show rel
. Bulletins of American paleontology. Cheilostome Bryozoa: Cheetham et al. 167. 10 5 Time interval (Ma) Text-figure 2.—Temporal distribution of 204 PPP and 124 DR collections, the abundance of bryozoan specimens (total 60,757; see text for counting method), and the numbers of species (total 250) represented in each interval. Ages of collections are medians of ranges; collections are grouped in "bins" ending in whole units, Ma. a more detailed classification such as that of Hageman et al. (1998), for two reasons. First, the great majority of species, 67%, show relatively little variation in pos- sessing single- to multilayered sheetlike or platelike colonies. With few exceptions, species in the encrust- ing category occur as small, usually rare colony frag- ments. Thus, the scope for recognizing subsets of mor- phologies in this group is restricted. Secondly, al- though erect and free-living species show many, much Q) o Q) Q. £ C > E O PPP ^^ Pacific 150 - r^ Bocas ' 100 y^ 50 n Canal 1 1 0 50 100 150 200 DR ^^^Cana ^-^-'"^urabo 00 ^^^-^ao 50 /Yaque 0 1 1 1 1 0 50 100 150 200 Cumulative number of collections Text-figure 3.—Cumulative curves (collecting curves) of species recovered with increasing numbers of collections examined (total 204 for PPP, 124 for DR). For each area, collections were added region by region (PPP) or section by section (DR), from oldest to youngest in each. 0) o a. (U J3 E > TO E O 150 100 50 0 By Age PPP 6Ma A 150 100 By Area "0 50 100 00 DR 6-3 Ma 9-6 Ma 50 (f <9Ma C. 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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