50 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [nn.i, 149. 
332 Hollick (Arthur). Marthas Vineyard Cretaceous plants. 
, Abstract: Geol. Soc. Am. Bull., vol. vii, pp. 12-14, 1896. 
Gives a list of the most prominently represented species and correlates 
the beds of the Amboy clays series. Remarks on the absence of lower 
Potomac strata. 
333 Recent discovery of the occurrence of marine Cretaceous strata 
on Long- Island. 
Abstract: Am. Assoc. Adv. Sci., Proc, vol. xliv, pp. 133-135, 1896. 
Describes recent observations of the author's on Long Island and dis- 
cusses their bearing on the extension of the Cretaceous formation. 
334 See Newberry (J. S.), No. 519. 
335 Holm (Theo.). Remarks upon Paleohillia, a problematic fossil plant. 
Bot. Gaz., vol. xxi, pp. 207-209, pi. xvii, 1896. 
Reviews Prof. Knowlton's description of this genus. 
336 Holman (F. C). Notes on certain water-worn vein specimens. 
Am. Inst. Mg. Engrs., Trans., vol. xxv, pp. 514-518, 1896. 
Describes an occurrence of water-worn quartz crystals occurring in a 
gold-bearing quartz vein, and discusses the origin of the attrition 
and deposition of the material. 
337 Holmes (J. A.). Corundum deposits of the southern Appalachian 
region. 
U. S. Geol. Surv., 17th Ann. Rept., Pt. Ill (Cont.), pp. 935-943, 1896. 
Describes the occurrence and distribution of corundum in the south- 
ern Appalachian region. 
338 Notes on the kaolin and clay deposits of North Carolina. 
Am. Inst. Mg. Engrs., Trans., vol. xxv, pp. 929-936, 1896. 
Describes the occurrence of kaolin in dikes and of clay deposits con- 
taining residual material of dike decomposition. Gives chemical anal- 
yses of kaolin and fire clay. 
330 Notes on the underground supplies of potable waters in the 
south Atlantic Piedmont plateau. 
Am. Inst. Mg. Engrs., Trans., vol. xxv, pp. 936-943, 1896. 
Describes the general distribution of underground waters in the 
region and gives a list of flowing wells in the Piedmont plateau of 
North and South Carolina. 
340 Hoover (Herbert C). Some notes on " crossings." 
Mining and Scientific Press, vol. lxxii, pp. 166-167, 1896. 
Describes the character and origin of certain vein phenomena in gold 
ore veins of California. 
341 Mining geology of Cripple Creek, Colorado. 
Mining and Scientific Press, vol. lxxiii, pp. 237-238, 1896. 
Synopsis of the report of Whitman Cross and R. A. F. Penrose, of the 
U. S. Geological Survey. 
342 Hopkins (T. C). The sandstones of western Indiana. 
U. S. Geol. Surv., 17th Ann. Rept., Pt. Ill (Cont,), pp. 780-787, 1896. 
Describes the character and distribution of sandstones of the Car- 
boniferous group in Indiana and gives several chemical analyses. 
