Smithsonian miscellaneous collections . useum, Catalogue No. 62547. The specimen represented by fig. 5 is from locality 4U, MiddleCambrian: Park shale, on the northwest side of Grizzly Gulchabout one-half mile southwest of the city of Helena, Montana. Obolns (llestonia ) ella ( Hall and Whitfield ) Fig. 6. ( X 2.) Impression of the interior of a ventral valve fromlocality 302s, Middle Cambrian Park shale in Grizzly Gulch,southwest of Helena, Montana. U. S. National Aluseum,Catalogue No. 51686a. Specimen figured by Walcott, fig. \g,Plate 47, Monogr. 51, \J. S. Geol. Survey, 1912. 7. (X 2,) Slig
Smithsonian miscellaneous collections . useum, Catalogue No. 62547. The specimen represented by fig. 5 is from locality 4U, MiddleCambrian: Park shale, on the northwest side of Grizzly Gulchabout one-half mile southwest of the city of Helena, Montana. Obolns (llestonia ) ella ( Hall and Whitfield ) Fig. 6. ( X 2.) Impression of the interior of a ventral valve fromlocality 302s, Middle Cambrian Park shale in Grizzly Gulch,southwest of Helena, Montana. U. S. National Aluseum,Catalogue No. 51686a. Specimen figured by Walcott, fig. \g,Plate 47, Monogr. 51, \J. S. Geol. Survey, 1912. 7. (X 2,) Slightly compressed and distorted ventral valve. U. S. National Museum, Catalogue No. 62548. 8. ( X 2.) Impression of the interior of a slightly distorted dorsal valve from the same locality as specimen repre-sented by fig. 6, showing the characteristic muscular im-pressions. U. S. National Museum, Catalogue No. figured by Walcott, fig. ik, Plate 47, Monogr. 51,U. S. Geol. Survey, 1912. ISCELLANEOUS COLLECTIONS vol. 64. BRACHIOPODA FROM PARK SHALE OF MIDDLE CAMBRIAN NO. 4 CAMBRIAN AND PRE-CAMBRIAN AT HELENA 3OI Obolus {Wcstonia) clla (Hall and Whitfield)—Continued. pagi: Fig. 9. (X^-) A distorted dorsal valve associated with the specimenrepresented by fig. 7, U. S. National Museum, CatalogueNo. 62549. Figs. 7, 8 and 9 are from the Middle Cambrian: (302s) Parkshale, on northwest side of Grizzly Gulch, about miles southwestof the city of Helena. 10. (X 10.) Enlargement by photography of the surface of aspecimen preserved in a shale where the exterior surfacedoes not adhere to the matrix. Where the surface clings tothe matrix, the specimens have the appearance of thoseillustrated by figs. 7 and 9. Fig. 10 is of a specimen from locality 4g, Middle Cambrian:about 325 feet ( m.) above the base of the Cambrian, in theFlathead shales of Peale, i mile ( km.) north of the junction ofEast and West Gallatin Rivers, Gallatin County, Montana. U. S. National Muse
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