An euryterid horizon in the Niagara formation of Ontaria
By: by M. Y. Williams.
Series: Canada. Geological Survey. Museum bulletin no. 20. Geological series, no. 29; Museum bulletin (Victoria Memorial Museum (Canada)) -- no. 20.
Publisher: Government printing bureau
Published: 1915
Place of publication: Ottawa
Language: eng
Number of pages: 21
Subjects: Paleontology -- Ontario.; Eurypterida.
Notes: Cover-title.

At head of title: Canada. Department of mines.