The fauna of the Chazy limestone / by Percy E. Raymond.

  • Raymond, Percy Edward, 1879-1952.
Date:
[1905]
Catalogue details

Licence: In copyright

Credit: The fauna of the Chazy limestone / by Percy E. Raymond. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    3/32 (page 353)
    Art. XXXVIII.— The Fauna of the Chazy JJ/niestone bv f' K,' y %j Percy E. Paymond. Introduction. In several papers on the Chazy, limestone, Brainerd and Seelv have ffiven sections showino; the lithological characters and thickness of the rocks at various localities from Chazy, Xe\v York, south to Orwell, Vermont.f These authors have divided the formation into three parts. A, B, and C, of whicli A is the base and C the top. These divisions arc founded partly on lithologic and partly on paleontologic grounds. Only a few species of fossils, however, were listed ; hence it has been the object of the present writer to ascertain Avliich are the common species in the Chazy, and to learn their strati- graphic and geographic distribution. For this purpose, detailed sections have been made at Crown Point, Yalcour Island, and Chazy, and extensive collections have been obtained at other places in the Champlain and Ottawa valleys. The sections will be fully described iu the Annals of the Carnegie Museum. In this place, however, only a synopsis of each is given. Distribution. The Chazy formation was named by Ebenezer Emmons;j; from the outcrops studied by him at Chazy village. New Y^ork, this locality, therefore, becoming the typical one for the formation. In stratigraphic position, the Chazy overlies the Beekman- town (Calciferous) and underlies the Lowville (Birdseye), member of the Mohawkian. It may be traced from Orwell, Vermont (along the Champlain Valley), to Joliette, north of Montreal, Canada. In the Ottawa Valley, it extends fi-om Hawksbury west to Allumette Island, 80 miles northwest of Ottawa. The formation is seen again at the Mingan Islands in the St. Lawrence, where it covers a small area. In the Lake Cham])lain region, these strata are mostl}^ lime- stone, and the thickness ranges from 60 feet at Orwell to 890 * Abstract of part of a thesis presented to the Faculty of the Yale Uni- versity Graduate School for the degree of Doctor of Philosophy. The detailed paper, with full discussion and illustration of species, will be pub- lished in early numbers of the Aiinals of the Carnegie Museum. For descrip- tion of the trilobites here mentioned, see Annals of the Carnegie Museum, vol. iii, p. 328, and this Journal, vol. xix, p. 377. Other new forms noted in the text are ’described at the end of the j^resent paper. f Amer. Geol., vol. ii, p. 323, 1888; Bull. Geol. Soc. Amer., vol. ii, p. 300, 1891 ; Bull. Amer. Mus. Nat. Hist., vol. viii, p. 305, 1896. X Geology of New York, Pt. 2, Eeport of the Second District, 1842, p. 107.