Age of the Rocky Mountain coal or lignitic formation

Clicks: 4
ID: 306602
1873
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Star

Ranked #200 of 8,486 articles by views in american journal of science

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 8,486 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
Age of the Rocky Mountain Coal 01' Lignitic Formation.[As the age of the Ugnitic formation of the Hocky Mountain region is far from decided, owing mainly to the contrary evidence afforded by the fossils of the vegetable and animal kingdoms, we propose to cite the arguments from different soul'ces bearillg on the subject, in order, if possible, to bring about agl'l'ement on this most important point in American geology.'Ve here give first the conclusions of ~Ir.r .. Lesq uereux from the fossil Plants, pn blished in Hayden'S Report for 1872.-EDS.]I. Views oj L. Lesquereuz.Not a single leaf has as yet been found in our Eocene identical with a Cretaceous species.The genera ('specially represented in the Cretaceous are: Sassafras, Oredneria, Platanus, Salix, Liquidamber, Quercus, Pop u litts, L/1•iodendron, Proteoides, Dombeiopsis, AceI', and Juglans.We can dispose at once of the genus Proteoides on account of its as yet unknown affinity.It hns been referred, as its name indicates, to Australian types, but from analogy I doubt if we may ascertrrin the presence of any of these types even in our oldest floras.Now, we have in our Cretaceous, as more easily recognized by their likeness to living species, leaves of ,-~'assalrg.sand of Liriodeudron, the tuliptree.If 1 should judge by the profusioll of leaves of Sassafras which I have seen in the shale of the Dakota group, in the valley of the Saline River, and al"Ound Fort Harker, in Kam:as, I would assert that more than two-thit'ds of the vegetation of this epoch did consist of species of tbis genus.But then, as now, however, related species appear to have lived in *
Reference Key
openalex_W2317682120 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Léo Lesquereux
Journal american journal of science
Year 1873
DOI
10.2475/ajs.s3-6.36.441
URL
https://ajsonline.org/article/65063.pdf
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.