April i, 1913] 



SCIENCE 



523 



land County, and since that time the writer 

 has examined two specimens from the collec- 

 tion of the Michigan Agricultural College, 

 both of which were secured near East Lansing, 

 one on April 20, 1901, by D. S. Bullock, and 

 the other in August, 1896, by T. L. Hankin- 

 son. 



Another species apparently new to the Mich- 

 igan fauna is Richardson's shrew, Sorex 

 richardsonii Bachman, a specimen of which, 

 taken at Chatam, Alger County, August 28, 

 1900, is in the collection of the Michigan 

 Agricultural College. Although Seton^ in- 

 cludes the northern peninsula in his map of 

 the range of the species, the writer can find 

 no recorded localities nearer than Oneida 

 County, Wisconsin,^ and the north shore of 

 Lake Superior. Northern Michigan has prob- 

 ably been included in the range because this 

 region formed a part of the " Northwest 

 Territory " ; it is not included by Merriam." 



The museum is indebted to the IT. S. Bio- 

 logical Survey for verifying the identifica- 

 tion of the specimens mentioned, and to Pro- 

 fessor W. B. Barrows, for the loan of the 

 specimens in the Michigan Agricultural Col- 



^®S®" Norman A. Wood 



Museum op Natural History, 

 University of Michigan 



interglacial records in new york 

 In Professor H. L. Fairchild's most inter- 

 esting address on " Pleistocene Geology of 

 New York State " the following statement ap- 

 pears -^ 



The accepted facts of multiple glaciation in the 

 Mississippi basin coupled with proofs of Prewis- 

 consin drift in Pennsylvania and New Jersey and 

 on Long Island, with accumulating evidences in 

 New England, demands the theoretical acceptance 

 of at least dual glaciation for New York state. 

 But the positive proof, in the field, of a Pre- 

 wisconsin ice sheet has not been found. 



^"Life Histories of Northern Animals," Vol. 

 II., p. 1107. 



' Hartley H. T. Jackson, Bull. Wisconsin Nat- 

 ural History Society, 1908, pp. 30-31. 



°" North American Fauna," No. 10, p. 48. 



• Science, XXXVII., No. 946, p. 238. 



A few years ago. Miss Maury" reported an 

 interglacial deposit at the south end of Cayuga 

 Lake, on the west shore between " Taughan- 

 nock Falls and Frontenac Beach in a small 

 ravine which has cut through one of the delta 

 terraces so common in Cayuga Valley." An 

 exposure gave the following vertical section: 



Drift 20 to 30 feet. 



Gravel and sand several inches. 



Fossiliferous clay 10 to 15 feet. 



Bowlder clay 10 to 15 feet. 



Devonian shales 10 feet above lake level. 



The lower bowlder clay is thought to repre- 

 sent the Illinoian invasion and is oxidized, 

 indicating a period of exposure to the air and 

 hence of erosion. The lower deposits are peaty 

 and contain a quantity of plant remains. The 

 upper fossiliferous deposits are a slaty blue 

 clay in which moUusks to the number of 

 eighteen species are found in abundance. 

 Twelve of these molluscan species are also 

 found in the interglacial Don beds of Toronto, 

 and the lake in which these animals lived was 

 doubtless contemporaneous with the large 

 Ontarian Lake in which the Don mollusks 

 lived. The thickness of the clay deposits 

 (10-15 feet) indicates a long period of de- 

 position. 



In the Watkins Glen-Catatonk Folio of 

 New York,' page 26, reference is made to an 

 older drift in Watkins Glen, underlying 100 

 feet of Wisconsin drift. In the blue clay 

 underlying the drift and overlying a bed of 

 sand and gravel, the leaf of an arctic willow 

 (Salix reticulatus) was found. Though this 

 deposit is stated by the authors to have prob- 

 ably been laid down during the advance of 

 the Wisconsin ice sheet, the inference is 

 strong, in view of the Cayuga Lake and the 

 Toronto interglacial deposits, in favor of its 

 being contemporaneous with the Scarboro 

 beds near Toronto which contain cold climate 

 animals and plants, including an undermined 

 willow (Salix sp.). The evidence of this 

 Cayuga Lake deposit appears to be quite as 

 conclusive as is that of the Toronto deposits. 



'Journal of Geology, XVI., pp. 565-567, 1908. 

 = Geologic Atlas, No. 169, 1909. 



