weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1894. 33 
102 Cragin (F. W.). New and little known Invertebrata from the Xeo- 
comian of Kansas. 
Am. Geol., vol. xiv, pp. 1-12, pi. i. 
Describes 17 new species from the Cretaceous of southern Kausas. 
102rt A contribution to the invertebrate paleontology of the Texas 
Cretaceous. 
Review : Am. Geol., vol. xiii, p. 124 (-£ p.). 
Noticed iu Bibliography and Iudex for 1892 aud 1893. 
1026 Crane (Agnes). The evo'ution of Brachiopoda. 
Abstract : Am. Geol., vol. xiii, p. 194 (•£ p.). 
Noticed in Bibliography and Index for 1892 and 1893. 
103 Crawford (J. J.). Twelfth .Report of the State Mineralogist. 
Cal. State Mg. Bureau, 12th Rept., pp. 1-411. 
Describes the occurrence of antimony, silver, lead, asphalt, bitumen, 
borax, chromic iron, coal, copper, gold, gypsum, iron, magnesite, man- 
ganese, natural gas, petroleum, quicksilver, building stones, asbestus, 
platinum, salt, soda, and zinc, in the various counties of California. 
101 Credner (H.). [Classification of Pleistocene deposits.] 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 195 and 197. 
Layers of sand between moraines are not to be considered as import- 
ant criteria in chronologic classification, on account of their local 
character. 
105 Crosby (W. O.). A classification of economic geological deposits 
based on origin and original structure. 
Am. Geol., vol. xiii, pp. 249-268; Tech. Quart., vol. vii, pp. 27-48. 
Discusses the general principles of classification aud describes the 
author's system, based on the following primary divisions : (a) Depos- 
its of igneous origin (igneous rocks). Heat is the chief agent. (6) De- 
posits of aqueo-igneous origin (pegmatite). Heat and water cooperate. 
(c) Deposits of aqueous origin (sedimentary and vein rocks). Water 
is the chief agent. 
105a Geology of Boston Basin. 
Abstracts: Am. Jour. Sci., 3d ser., vol. xlvii, p. 79 (71.); Am. Geol., 
vol. xiii, pp. 192-193 (■£ p.). 
Noticed in Bibliography and Index for 1892 and 1893. 
105ft Origin of the coarsely crystalline vein granites or pegma- 
tites. 
Abstract: Am. Geol., vol. xiii, pp. 215-216 (f p.). 
106 and Ballard (H. O.). Distribution and probable age ol the 
fossil shells in the drumlins of the Boston Basin. 
Am. Jour. Sci., 3d ser., vol. xlviii, pp. 486-496. 
Gives a list of 55 species collected in the Boston Basin, describes the 
distribution, and concludes that they are of Glacial and post-Glacial 
origin and indicate a recession of the ice sheet in this region. 
Bull. 135 3 
