F. Carney — Form of Outwash Drift. 341 



subglacial valleys and subglacial loaded streams ; topographically 

 these streams should flow out upon a plain where their individ- 

 ual fans may coalesce. It is also evident, as Salisbury states 

 elsewhere, that the degree of development of this drift-form 

 varies with the time the ice stands at a given halt. 



Wood worth alludes* to a washed drift which confronts the 

 terminal moraine on Long Island ; this formation, as described, 

 is a normal outwash plain. 



In his description of the drift in southern Wisconsin, Aldenf 

 describes an " outwash apron " which constitutes a portion of 

 the deposits in the interlobate angle between the Lake Michi- 

 gan Glacier and the Delavan lobe ; his usage of the term out- 

 wash elsewhere in the paper is also in accord with the standard 

 of definition. 



In applying this definition to the localization of drift 

 referred to on the north slope of Bluff Point, we note the fol- 

 lowing facts : (1) the absence of an initial plain, (2) the prob- 

 able absence of a strong subglacial stream, (3) a constancy in 

 the position of adjacent ice-lobes which built up lateral mo- 

 raines, (4) a synchronous accumulation of debris at the reentrant 

 ice-angle, (5) diverging slopes to the south that insured rather 

 active drainage away from this angle, and (6) a single alluvial 

 fan-like body of washed drift blending northward into moraine. 



The normal outwash plain is an assemblage of such alluvial 

 fan-like units. The drift in question is quite identical with 

 an outwash plain in structure, but different from it in degree 

 of development and in topographic environment; ignoring the 

 latter discrepancy, we may say it is a very subdued form of 

 outwash plain that represents a constant position of the ice at 

 the junction of two rather small valley dependencies. 



Since Bluff Point is a not uncommon type of topography in 

 the Finger Lake region, and since the writer has mapped on 

 the Moravia quadrangle similar deposits of drift, he suggests, 

 as a designation for such deposits, the term inter-lobule (or 

 inter-tongue) fan. 



* N. Y. State Mus. , Bulletin 84, p. 90, 1905. 



f Prof essional Paper, No. 34, U. S. Geol. Surv., pp. 31-2, 1904. 



Am. Jour. Sci.— Fourth Series, Vol. XXIII, No. 137.— Mat, 1907. 

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