Report of the Committee on Paleoecology, 1935-1936: Presented at the Annual Meeting of the Division of Geology and Geography, National Research Council, May 2, 1936 (1936) / Chapter Skim
Currently Skimming:
Paleoecology of the Arthropoda - Percy E. Raymond
Paleoecology of the Arthropoda - Percy E. Raymond
Pages 22-28
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 22... ...
For example, the flattened segments of the posterior endopodites of Triarthus suggest that it was a more successful swimmer than crawler, whereas the stout limbs of Neolenus indicate that
|
From page 23... ...
were probably made by similar trilobites. The blind or nearly sightless trinucleids probably sought their food in the superficial layers of the bottom ooze, ploughing along Just beneath the surface of the mud, as does Ltaiulus.
|
From page 24... ...
They are.the most abundant fossils of the sandy and shaly Mid-Devonian strata of New York and the Allegheny plateau, but although Phacops occurs in considerable abundance in the calcareous Hamilton equivalents in the Mississippi basin, Tropidoleptus seems to be rare or absent west of New York. The one instance in which there seems to be a definite correlation between the type of trilobite and the nature of the sediment is in the finegrained black shale and fine-grained black limestone of the Ordovician.
|
From page 25... ...
However, their very large eyes give one the impression that, like certain modern crustaceans mentioned by Dollo, their natural habitat was deep water, but that they were nocturnal visitors near the surface. Very likely they fed on graptolites, and were rather efficient swimmers.
|
From page 26... ...
Specimens of Ordovician eurypterids are found in marine sediments, but all are very fragmentary, hence the animals lived in rivers, and pieces of their skeletons were occasionally carried into the sea. Specimens found in late Silurian strata are remarkably complete, which shows that -tine animals were at home in fresh water, and were killed immediately if by any chance they were carried "by currents into salt water.
|
From page 27... ...
We know thousands of marine for every fresh-water Carboniferous fossil. This report touches upon but a few of the subjects ifaich are involved in the study of the paleoecology of the Arthropoda.
|
From page 28... ...
Staff, Hans v. and Reck, Hans: Ueber die Lebenweise der Trilobiten.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.