The deep boring at Spur . s in thesamples coming from the shaly dolomite beds. Some seemto come from the shale, which is interbedded in the dolo-mite. Ammodiscus, a flat spiral form, frequently noted inthe Cisco, was found at from 3755 to 3760, 3775 to 3780,3795 to 3800, and from 3900 to 3905 feet. (Fig. 15: a.)Sponge spicules were also noted in several thin sections ofthe dolomite. Undoubted specimens of sponge spicules werenoted below 3800 feet in several samples, evidently havingcome from shale. In a fragment of limestone from 3185 to3190 feet there was a section of some bivalve, much frac-
The deep boring at Spur . s in thesamples coming from the shaly dolomite beds. Some seemto come from the shale, which is interbedded in the dolo-mite. Ammodiscus, a flat spiral form, frequently noted inthe Cisco, was found at from 3755 to 3760, 3775 to 3780,3795 to 3800, and from 3900 to 3905 feet. (Fig. 15: a.)Sponge spicules were also noted in several thin sections ofthe dolomite. Undoubted specimens of sponge spicules werenoted below 3800 feet in several samples, evidently havingcome from shale. In a fragment of limestone from 3185 to3190 feet there was a section of some bivalve, much frac-tured. (Fig. 15 :f.) Fossils from the Sandy Dolomite Beds From 2677 to 2956 Feet In thin sections of dolomite coming from 2677 to 2682feet, and again from 2709 to 2735 feet below the surface,a form like a Nodosaria was noted. (Fig. 15 :b, c, d.) Inanother section of dolomite from between 2950 to 2956 feetappears a fossil which perhaps is a tangential section of theshell of a ribbed brachiopod, near its beak. (Fig. 15 :e.). ^^^>-^; f^^^ T 3.^ -37 \ V^ a-d, X 40 e-f, X 20. The Deep Boring at Spur 85 From 2244 to 2264 Feet In the core of mostly oolitic dolomite taken at this depth,the following fossils were seen either in thin sections ormacroscopically. a. Seen in thin sections. 1. Cellular tissue in a shred of bituminous yellow material im-bedded in dolomite. Figure 16: b. In the same section were many-smaller shreds of structureless yellow or brown material of similarnature and also two round bodies resembling spores. Figure 16: a, c. 2. Trochammina Figure 16: e.
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Keywords: ., bookauth, bookcentury1900, bookdecade1910, bookidcu31924004622084
