46 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 162. 
317 Grresley ( W. S.). Clay veins vertically intersecting Coal Measures. 
Geol. Soc. Am., Bull., vol. ix, pp. 35-58, figs. 1-27, 1898. 
Describes the occurrence and character of veins in coal, and discusses 
their age and origin. Includes a bibliography of the subject. 
318 Grimsley (G. P.). Gypsum in Kansas. 
Kan. Acad. Sci. , Trans., vol. xv, pp. 122-127, 1898. 
Describes the occurrence and distribution of the gypsum beds. 
319 The study of natural palimpsests. 
Kan. Acad. Sci., Trans., vol. xv, pp. 127-130, 1898. 
Discusses the origin of metamorphic rocks. 
320 The gypsum deposits of Kansas. 
The Mineral Industry, 1897, pp. 395-396, 1898. 
Describes the occurrence, character, and distribution of the deposits. 
321 G-riswold (Leon S.). The geology of Helena, Montana, and 
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Assoc, of Eng. Soc. Jour., vol. xx, No. 1, pp. 51-68, 3 figs., 1898. 
Describes the character and occurrence of the igneous and meta- 
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322 Gulliver (F. P.). Classification of coastal forms. 
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323 Note on Monadnock. 
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324 Gwillim (J. C). Some west Kootenay ore bodies [British 
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Federated Can. Mg. Inst., Jour., vol. iii, pp. 19-26 ; Can. Mg. Rev., vol. 
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H. 
325 Hall (James). A discussion of Streptelasma and allied genera of 
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N. Y., 15th Ann. Rept. State Geologist, vol. i, pp. 24-25, 1897. 
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326 — - The Paleozoic hexactinellid sponges constituting the family 
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N. Y., 15th Ann. Rept. State Geologist, vol. i, pp. 25-26, 1897. 
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327 — - and Clarke (John M.). The new species of Brachiopoda 
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N. Y., 14th Ann. Rept. State Geologist, pp. 325-372, 14 pis., 4 rigs.; 
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1897. 
