Geology and Mineralogy. 



397 



II. Geology and Mineralogy. 



1. Notes on the Geology of the Gulf of St. Lawrence; by 

 J. M. Clarke. Bull. 149, N. Y. State Museum, pp. 121-133, 

 1911. — The author during his annual summer vacations along 

 the southwestern shores of the Gulf of St. Lawrence continues to 

 interest himself in the local geology. In this paper he discusses: 



(1) the relations of the Paleozoic terranes in the vicinity of Perce; 



(2) eruptive contacts in the marine Devonian Dalhousie beds at 

 Dalhousie, New Brunswick, concluding that they are contempora- 

 neous lavas, tuffs, and ash beds, a determination which therefore 

 fixes the time of these widely spread ejections as of the age of the 

 Lower Devonian ; (3) the stratigraphy of the Devonian fish beds of 

 Scaumenac, Quebec ; and (4) history of the lead mines of Gasp6 

 basin. The author states : " It is a singular illustration of the 

 undying persistence of legend in the face of well-established fact 

 that a forlorn hope early dismantled should have revived and been 

 persistently pursued for well nigh 250 years." c. s. 



2. Observations on the Magdalen Jsiands, by J. M. Clarke ; 

 and The Carbonic Fauna of the Magdalen Islands, by J. W. 

 Beede. Bull. 149, N. T. State Museum, pp. 1-50, 1911. — 

 In this work are described the history, topography, geology, and 

 paleontology of the Magdalen Islands. The lowest rocks are of 

 the Windsor series, regarded hj Beede as of Kinderhook age. 

 These rocks are overlain by a series of red shales and sandstones 

 devoid of marine fossils and are probably of continental origin. 

 They are correlated with the red beds of Prince Edward Island, 

 which have yielded bones of a pelycosaurian reptile and are 

 sometimes regarded as of Permian age. 



The paper is well illustrated and is written in Doctor Clarke's 

 interesting style. The Windsor series here has yielded a fauna 

 of 65 species, of which at least 17 forms also occur in Nova 

 Scotia. c. s. 



3. Some JSTew American Fossil Crinoids ; by Frank Springer. 

 Mem. Mus. Comp. Zool., 25, pp. 117-161, pis. 1-6, 1911.— The 

 author here revises the families Gasterocomidse and Poteriocrinidse 

 and as well their genera, of which there are 26, one, Schultzicrinus, 

 being new. Dimerocrinus is redefined, and a new American spe- 

 cies of Marsupites is described. Of species described there are 12. 



Much study has been given to the mode of articulation of the 

 arms, that is, the nature of the radial facets. Among crinoids 

 there are at least four kinds of articular surfaces typified by (1) 

 Poteriocrinidse, (2) Forbesiocrinus, (3) Cyathocrinidse, and (4) 

 Camerate crinoids. c. s. 



4. Middle Cambrian Annelids ; by Charles D. Walcott. 

 Smithsonian Misc. Col., 57, No. 5, pp. 109-144, pis. 18-23, 1911. 

 — The Burgess shale of British Columbia yields remarkably per- 

 fect fossils and in this paper Doctor Walcott describes one new 



