Lower Cambrian ptychopariid trilobites from the conglomerates of Quebec.
Series: Smithsonian miscellaneous collections,; v. 128, no. 7; Smithsonian miscellaneous collections ;; v. 128, no. 7.
Publisher: Smithsonian Institution
Published: 1955
Place of publication: Washington
Language: eng
Number of pages: 35
Subjects: Ptychopariida.; Paleontology -- Cambrian.; Paleontology -- Saint Lawrence River Valley.
Notes: Smithsonian Institution.  Publication 4216.