July 20, 1917] 



SCIENCE 



69 



remarkable stelleroid belongs to the subclass 

 Auluroidea. It is believed to be a primitive 

 ophiuroid, which was still very close to the 

 ancestral asterozoans. 



The Ordovician strata of Ottawa Valley are 

 described in summary style by Raymond/ 

 The formational nomenclature and relation- 

 ships are . indicated in the accompanying 

 table. Gloucester is a new formation name 

 applied to the carbonaceous shales between the 

 Collingwood and Cincinnatian strata. In 

 correlating- the Ottawa formations with those 

 of New York, Kentuclvy, and Minnesota, Ray- 

 mond makes a number of radical departures 

 from the conclusions of Ulrich and Bassler. 

 In certain details, tlie correlation chart^ is . 

 not in complete harmony with the statements 

 made on the accompanying pages of text, as, 

 for example, in regard to the faunal relations 

 of the Kentucky Ciu-dsville. 



The limestones of the Kingston district are 

 described by Kindle.^ The formations recog- 

 nized are indicated in Fig. 1, which departs 

 from Kindle's usage only in the separation of 

 the Decorah zone as ■ a distinct stratigraphic 

 imit above the Lowville-Leray. The term, 

 " Rideau," originally proposed by Ami^" in 

 terms which, in the reviewer's opinion, in- 

 clude the Potsdam sandstone described by 

 Baker as noted above, is applied to the green- 

 tinged, arkosic and generally conglomeratic, 

 shaly beds at the base of the Pamelia forma- 

 tion. Accompanying the description of Ordo- 

 vician strata is a report upon their faunas by 

 Miss Wilson and K. F. Mather.^i Faunal 



' P. E. Raymond, ' ' The Correlation of the Ordo- 

 vician Strata of the Baltic Basin with those of 

 Eastern North America, ' ' Harvard College Mus. 

 Comp. Zool., BuU., Vol. 56, pp. 179-286, 1916. 



s Eaymond, op. cit., p. 257. 



E. M. Kindle, ' ' The Ordovician Limestones of 

 the Kingston Area," Ontario Bur. Mines, Ann. 

 Eept., Vol. 25, Pt. 3, pp. 37-i4, 1916. 



10 H. M. Ami, ' ' Ordovician Succession in East- 

 ern Ontario, ' ' Geol. Soe America, Bull., Vol. 13, 

 pp. 517-518, 1902. 



"Alice E. Wilson and Kirtley F. Mather, 

 "Synopsis of the Common Fossils of the Kingston 

 Area," Ontario Bur. Mines, Ann. Kept., Vol. 25, 

 Pt. 3, pp. 45-66, 1916. 



lists and descriptive keys to the common 

 fossils are aranged in two parts, one for the 

 Black River and the other for the Trenton 

 rocks. 



Quelec. — The district about Lake St. John 

 at the head of Saguenay River in Quebec is 

 of interest to the stratigrapher because of the 

 occurrence of Paleozoic sediments far within 

 the limits of the Pre-Cambrian " shield " of 

 northern Canada. These outliers, described 

 by Dresser,^- are preserved in a basin formed 

 by normal faulting which may have occurred 

 at the close of the Paleozoic Era. The sedi- 

 ments include Trenton limestone, Utica shale, 

 and Richmond limestone, said to be " de- 

 posited in conformable succession." 



Fossils from the Trenton and Utica were 

 identified by Raymond. The Trenton fauna 

 is preponderantly molluscan and is probably 

 basal Trenton, " about the horizon of the 

 Rockland beds of the Ottawa district." The 

 Utica fauna is small and not distinctive. Ac- 

 cording to Foerste, the Richmond faunas cor-i^ 

 respond to those of the Waynesville member 

 of the Ohio Richmond. 



SILURUN 



A star-fish from the Arisaig series at the 

 mouth of Stonehouse brook, Nova Scotia, is 

 described by Ruedemann^^ as a new variety 

 of Urasterella ruthveni of the Upper Ludlow 

 in England. 



DEVONIAN 



E. M. Kindle^* records the occurrence of 

 limestones containing a Devonian coral at 

 Gull Lake, in the lower MacKenzie Valley, 

 where published data show only Cretaceous 

 and pre-Cambrian terranes. Two other small 

 collections of Devonian fossils from Mac- 

 Kenzie Valley, one from within the Arctic 

 circle, are commented upon. 



1= J. A. Dresser, "Geological Structure of the 

 Basin of Lake St. John, Quebec," Trans. Boy Soc. 

 Canada, Ser. 3, Vol. 10, Sec. 4, pp. 125-130, 1916; 

 "Part of the District of Lake St. John, Quebec," 

 Geol. Surv., Canada, Memoir 92, 1916. 



13 Op. cit., p. 46. 



i* E. M. Kindle, "Notes on Devonian Faunas of 

 the MacKenzie River VaBey," Avi. Jour. Sci. (4), 

 Vol. 42, pp. 246^8, 1916. 



