weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1895. 35 
123 Dowling (D. B). Notes on the stratigraphy of the Cam bro- Silu- 
rian rocks of eastern Manitoba. 
Ottawa Nat., vol. ix, pp. 67-74. 
Describes the lithologic character and succession of Lower Silurian 
rocks in the vicinity of Lake Winnipeg and gives a sketch map of this 
lake. 
124 Bumble (E. T.). Cretaceous of western Texas and Coahuila, 
Mexico. 
Geol. Soc. Am., Bull., vol. vi, pp. 375-388. 
Gives a detailed section of the rocks of San Lorenzo, Coahuila. De- 
scribes the lithologic characters and names some of the fossils found in 
the Bosque, Fredericksburg, and Washita divisions of the Lower Cre- 
taceous. Describes the distribution of the Dakota, Colorado, and Mon- 
tana divisions of the Upper Cretaceous in Texas. Gives a general sec- 
tion of the Montana rocks and a list of fossils determined by Mr. T. W. 
Stanton. 
125 Volcanic dust in Texas. 
Science, new ser., vol. i, pp. 657-658 (correspondence). 
Describes the occurrence of volcanic dust in material of which the 
larger part is formed of diatoms. Refers to the description of volcanic 
dust by H. W. Turner and quotes from Professor Cope as to the geologic 
age of the deposits from Avhich the volcanic dust was obtained. 
e. 
120 Earle (Charles), Osborn (H. F.) and. Fossil mammals of the 
Puerco beds. 
Am. Mus. Nat. Hist., Bull., vol. vii, pp. 1-70, tigs. 120-121. 
See Osborn (H. F.) and Earle (Charles) No. 362. 
127 Edwards (Arthur M.). The occurrence of Tertiary clay on Long 
Island, N". Y. 
Am. Jour. Sci., 3d ser., vol. 1, p. 270 (f p.) (communicated). 
Describes the occurrence of upper Miocene clay containing marine 
Bacillariaceie on Long Island. 
128 Eldridge (George H.). A geological reconnoissance across Idaho. 
U. S. Geol. Surv., 16th Ann. Rept., part ii, pp. 211-276, pis. xv-xvii, figs. 
38-41. 
Describes the topography of central Idaho, the drainage systems of 
the Snake and Columbia rivers, and the occurrence of granite and nieta- 
morphic and unaltered sedimentary rocks. Discusses the general struc- 
tural features. Describes the gold and silver deposits and coal veins 
of the region. 
129 Elftman (Arthur Hugo). Notes upon the bedded and banded 
structures of the gabbro and upon an area of troctolyte. 
Minn. Geol. and Nat. Hist. Surv., 23d Ann. Rept., pp. 224-230. 
Describes the megascopic characters and field relations of gabbro in 
northeastern Minnesota and its microscopic features. 
130 Ells (E.W.). The Potsdam and Calciferous formations of Quebec 
and eastern Ontario. 
Roy. Soc. of Canada., Proc. and Trans., vol. xii, sect, iv, pp. 21-30. 
Describes tho character and distribution of the Potsdam and Calcifer- 
ous rocks in tho Ottawa and St, Lawrence basins and also of the Cam- 
brian in eastern Quebec, 
