By R. A. (editor) Davis
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Additional info for Cincinnati Fossils : An Elementary Guide to the Ordivician Rocks and Fossils of the Cincinnati, Ohio, Region
Example text
Stromatoporoids study organic o r t o o t h e r o b j e c t s , for e x a m p l e , snail shells, t h e r e is a p a t t e r n of s h a l l o w g r o o v e s radiating after complex b e p r e s e r v e d a s fossils. T h e s e t u b e s , w h i l e t h e ing of a c a n a l f e e d i n g d o w n into t h e mass of only a w o r m s a r e a l i v e , a r e f a s t e n e d t o t h e sea f l o o r the colony. In many types of stromatoporoids opening. of posed of calcium carbonate and, hence, can i n t h e c e n t e r o f e a c h b u m p ; this i s t h e o p e n - canal composed live.
C e p h a l o n characterized by sharply d e f i n e d glabella w i t h t h r e e d e e p lateral grooves. Pygidium small, continuing pattern of body segments. Fig. 23: Enrolled specimen. Maysvillian and Richmondian. 24 A n u m b e r of d i f f e r e n t b r y o z o a n g e n e r a (for example, Corynotrypa, Proboscina, and Stomatopora) form delicate networks of t u b u l a r z o o e c i a o n o t h e r o b j e c t s (in this c a s e , another bryozoan colony). Although figure 10 is e n l a r g e d , a m u c h g r e a t e r e n l a r g e m e n t w o u l d b e necessary t o i d e n t i f y just w h i c h g e n u s is f i g u r e d .
This n a m e is appropriate because the distinctly have S c o l e c o d o n t s a r e so small that a m i c r o s c o p e is "layered skeleton of these colonial creatures most ofappears worms material similar to y o u r fingernails. T h e y a p - Stromatoporoidea. name annelid s t r u c t u r e s c a l l e d s c o l e c o d o n t s ( P I . I I , F i g . 26). non-descript as the m o r e standard sponges. are kinds o f " w o r m s " d o p r o d u c e identi- f i a b l e fossils, h o w e v e r . O n e group of poriferans w h i c h is represented can com- the once-soft sediment we n o w see as rock.