Impressions and footprints of aquatic animals and imitative markings on Carboniferous rocks

@article{DawsonImpressionsAF,
  title={Impressions and footprints of aquatic animals and imitative markings on Carboniferous rocks},
  author={J. Dawson},
  journal={American Journal of Science},
  volume={s3-5},
  pages={16 - 24}
}
THE footprints and other markings of aquatic invertebrate animals and of fishes are necessarily, for the mm;t part, lesR distinctive and important than those of bnd animals, both because less characteristic in themselves, and because reproduced under similar forms in very different geological periods. The former peculiarity bas caused them to be neglected as of little importance, or to be confounded with impressions of plants. With reference to the latter, I bave myself shown tbat the… Expand

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TLDR
A consistent, significant difference is found between the angle of the footprints in trackways from glacial and from non-glacial localities, which suggests that the glacial deposits in the northeastern part of the country are younger than those in the western and southern parts. Expand
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