A Manual of Palontology for the Use of Students With a General Introduction
A Manual of Palontology for the Use of Students With a General Introduction
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Oldhamia occurs in certain green and purple grits of Lower Cambrian age, at Bray Head, in Wicklow, Ireland, where the fronds are found in great abundance, matted together, and spreading over the surfaces of the strata. A species of Oldhamia is also said to occur plentifully in the Potsdam Sandstone (Upper Cambrian) of Wisconsin, in North America. Oldhamia antiqua, the commonest species, consists of a central thread-like axis from which spring bundles or umbels of short radiating branches (fig. ...53), at regular in- VOL. I. L 162 CCELENTERATA.
tervals. Each branch " is formed of a series of articulations marking the position of minute cells" (E. Forbes). Old- hamia has been variously referred to the Sertularian Zoo- phytes, to the Polyzoa, and to the vegetable kingdom. The most probable conjecture, perhaps, would refer the genus to the calcareous sea-weeds (Salter).
III. SUB -CLASS GRAPTOLITIM (Graptolites EHABDO- PHORA, Allman). The Graptolites form a very large and important family of fossils which usually present themselves in the shape of horny linear bodies, toothed or serrated upon one or both sides, and often combined into more or less complex sys- tems.
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To quickly assess the difficulty of the text, read a short excerpt:
Oldhamia occurs in certain green and purple grits of Lower Cambrian age, at Bray Head, in Wicklow, Ireland, where the fronds are found in great abundance, matted together, and spreading over the surfaces of the strata. A species of Oldhamia is also said to occur plentifully in the Potsdam Sandstone (Upper Cambrian) of Wisconsin, in North America. Oldhamia antiqua, the commonest species, consists of a central thread-like axis from which spring bundles or umbels of short radiating branches (fig. ...53), at regular in- VOL. I. L 162 CCELENTERATA.
tervals. Each branch " is formed of a series of articulations marking the position of minute cells" (E. Forbes). Old- hamia has been variously referred to the Sertularian Zoo- phytes, to the Polyzoa, and to the vegetable kingdom. The most probable conjecture, perhaps, would refer the genus to the calcareous sea-weeds (Salter).
III. SUB -CLASS GRAPTOLITIM (Graptolites EHABDO- PHORA, Allman). The Graptolites form a very large and important family of fossils which usually present themselves in the shape of horny linear bodies, toothed or serrated upon one or both sides, and often combined into more or less complex sys- tems.
What to read after A Manual of Palontology for the Use of Students With a General Introduction?
You can find similar books in the "Read Also" column, or choose other free books by Nicholson Henry Alleyne to read onlineMoreLess
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