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Report of the Committee on Paleoecology, 1936-1937; Presented at the Annual Meeting of the Division of Geology and Geography, National Research Council, May 1, 1937 (1937) / Chapter Skim
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Paleoecology of the Foraminifera - J. A. Cushman
Pages 7-10

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From page 7...
... As a rule- the pelagic foraminifera exist in the, warm .surface waters, of the Gulf Stream-and the similar warm currents of the other oceans. -.; They exist until they meet cold currents and then 'apparently die quickly, ancf.
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From page 8...
... Many of the same pelagic genera developed in the Cretaceous exist in the present oceans, and it seems rather warranted to infer that conditions at the two periods were more or less similar as to the temperature of the ocean surface. That warm ocean currents existed at those and later periods seems safe to infer as in the depositional series pelagic forms may dominate in some layers and then for a time give way to those of more shallow or colder waters just as they do in cores recently taken from the present ocean floor.
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From page 9...
... The"range in depth, is less restricted as temperature seems to be the most., definite control^-.' As temperatures at these depths are less variable and have less seasonal range the environmental conditions are more uniform, and as a result the species are widely distributed. That such conditions have prevailed during the Tertiary;,' at least, is shown by the Eocene, Oligocene and Miocene deposits of the Gulf and Atlantic Coastal Plain regions of the Southeastern United States where the faunas of apparently the same ages change as one goes toward the present shore line just as the faunas of the present ocean change in passing-outvfrom- shore line,, .„
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From page 10...
... These lines were taken from shallow water well out onto the slope of the Continental Shelf and have been carefully taken with bottom temperatures and depths. A qualitative and quantitative study of those samples is under way, and it is hoped the results will give basic data for the study of at least late Tertiary sediments with considerable accuracy as to the ecologic conditions under which they were deposited.
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Key Terms

  • shallow waters
  • continental shelf
  • warm ocean
  • ocean bottom
  • pelagic foraminifera

  • ocean currents
  • pelagic forms
  • late tertiary
  • comparatively shallow
  • calcareous forms

  • shore line
  • fossil series
  • basic data
  • foraminifera living
  • ocean surface

  • warm currents
  • tertiary times
  • althcjugh foraminifera
  • abyssal conditions
  • ocean floor

  • typical abyssal
  • similar warm
  • living foraminifera
  • bottom conditions
  • ocean change

  • pelagic genera
  • normal pelagic
  • littoral foraminifera
  • tertiary faunas
  • ries pelagic


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