File:The American Museum journal (c1900-(1918)) (18160304765).jpg

Title: The American Museum journal
Identifier: americanmuseumjo11amer (find matches)
Year: c1900-(1918) (c190s)
Authors: American Museum of Natural History
Subjects: Natural history
Publisher: New York : American Museum of Natural History
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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where a somewhat simihir t'oniiat ioii (>c(iii'>. lie iil)- tailied intoi'iiiat u>ii in I'euai'd to local eolleetors. iiiid was aMe liiinseli'to gather a larj;'e lliuiilier i>r specimens. The eolliH'tin^ in the Ohio fields is hy no means an easy task. ()ne of I lie liesl-know ii localities has been overurow n by the city of CUncland. The fossils oceni' in the core of slaty conci-etioiis which a))- ))ear sparinuly scattefed in the >()l't !ilacl\ l)c\i)nian shales of that locality. These crumble almost like sand and are weathered away durinu' the changes of sjjrinu' and fall, exposing here and there great flat concretions usually of cir- cular outline. Where the shales afc (leei)ly cut down by the waterways concretions nuiy be found jutting out of the banks, but. in such posi- tions they cannot readily be obtained until by contin- ue I weatheritig they have dropped into the IxmI of the stream. On the other hand, where the shales lie over large surfaces the concretions can readily be examined. Only rafcly however do they con- tain well-preserved fossils. About fifty concretions con- taining fossils were brought to the laboratory of the de- l)artment and will be worked outdm-ing the ))resent winter. It is hoped that they will furnish important data for the
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