In 1914, Walcott published1 an admirably illustrated account of presumably algal structures from Proterozoic (Algonkian) strata in various parts of North America. Chief among these were representatives of six supposed genera and nine species collected by M. Collen from “the eastern slope of the Big Belt Mountains, 8 miles (12.8 km.) west of White Sulphur Springs, at forks of Birch Creek, Meagher County, Montana.” No detailed geologic data were given; and, though descriptions announced a prospective visit to the locality, no further publications resulted. Hence, writers, such as Holtedahl,2 discussing the nature of Walcott’s material, were forced to do so without the advantage of geologic information, and without the information that Walcott himself doubtless secured when he collected and observed the stratigraphic relationships of the material on which his species were based.

The writers’ first visit to the Newland algal locality, made in 1932, was brief and resulted only . . .

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.