On the relations of the Niagara and Lower Helderberg formations, and their geographical distributions in the United States and Canada
By: by James Hall.
Contributors: Worthen, Amos Henry, 1813-1888.; American Association for the Advancement of Science.
Series: CIHM/ICMH microfiche series -- no. 34436.
Publisher: s.n.]
Published: 1982
Place of publication: [Salem, Mass.?
Language: eng
Format: Microform
Number of pages: 335
Subjects: Geology, Stratigraphic -- Paleozoic.
Notes: Criticism of A.H. Worthen's article, remarks on the relative age of the Niagara and so-called Lower Helderberg group.

Caption title.

Reproduction of original in: Library of Congress, Photoduplication Service.

Pre-1900 Canadiana.

"From the Proceedings of the American Association for the Advancement of Science, Portland Meeting, August, 1873."

Microfiche. Ottawa : Canadian Institute for Historical Microreproductions, 1982. 1 microfiche (11 fr.) ; 11 x 15 cm. (CIHM/ICMH Microfiche series = CIHM/ICMH collection de microfiches ; no. 34436).