Bulletin of the Chicago Academy of Science (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 Excerpt: ...by numerous pits in linear series. This may be a small spine from some Echinoderm. Also a hollow conical tooth or spme, evidently that of a fish, also broken, but still.25 m. m. in length. BOULDER-CLAY FROM A WELL AT ROSENFELD, MANITOBA. This material, sent to me under the name of " Hard-Pjn," was obtained at a depth of 135 feet, in a well bored by the Canadian Pacific Railroad Company at Rosenfeld, Manitoba. It formed, mixed with gravel and boulders, a layer of eighteen feet in thickness, below the post-glacial alluvial deposits of the Red River Valley and resting on a Silurian shale. As the well was bored with an ordinary percussion drill, it is possible that some matter from the alluvial deposits above referred to may have been mixed with the specimen of "hard-pan," but so far as examined these alluvial deposits do not hold any organic forms. Numerous small particles of steel from the edge of the drill occur in the six preparations representing this clay. The inorganic constituents are coarse in texture; quartz grains, of which nearly one-half are perfectly rounded, as usual predominating. Bottlegreen hornblende is moderately abundant as are also fragments of feldspar and limestone, but shaly materials are almost altogether wanting. Bodies of organic origin are rather scarce, Foraminifera, however, being most common, and a Textularia of the type of T. globulosa is characteristic. A few Rotalidae are also present, with broken chambers of other Foraminifera. The examination of a greater quantity of the material would doubtless lead to the discovery of all the ordinary Cretaceous types. BOULDER CLAY FROM THE SOUTH SASKATCHEWAN RIVER TEN MILES EAST OF THE MOUTH OF THE SWIFT CURRENT. This and the two following localities in the Canadian no...