Annual report . arity of shapes. Some of them are elongated and withsomewhat steep slopes. The longest of the hills trends in a north-east-southwest direction. It may represent a deposit made by asubglacial stream or stream emerging from the edge of the glacier. The materials of composition of the hills are fairly distinctive incharacter. There is a predominance of gravel, consisting of smalland large pebbles and cobbles together with course sand and frag-ment of the local bedrock. No exposures were found sufficient todetermine the arrangement of the materials. There is a ridgelike accumulatio
Annual report . arity of shapes. Some of them are elongated and withsomewhat steep slopes. The longest of the hills trends in a north-east-southwest direction. It may represent a deposit made by asubglacial stream or stream emerging from the edge of the glacier. The materials of composition of the hills are fairly distinctive incharacter. There is a predominance of gravel, consisting of smalland large pebbles and cobbles together with course sand and frag-ment of the local bedrock. No exposures were found sufficient todetermine the arrangement of the materials. There is a ridgelike accumulation of gravel just west of the largekettle which suggests heaping effects against an ice-block. The Lake Albany deposits. A large part of the area of the Schen-ectady sheet is covered with deposits of clays and sands which arecontinuous with similar deposits lying to the east and which havebeen interpreted by Woodworth and others as deposits of deltaorigin made in the extensive body of glacial waters known as Lake. ffi GLACIAL GEOLOGY OF THE SCHENECTADY QUADRANGLE 17 Albany. Southward from Schenectady lies the sand plain region,the materials of which are described by Woodworth1 as the mostextensive deposits of this nature (delta) in the Hudson if not alsoin the Champlain valleys. A portion of this plain, developed in itscharacteristic topographic features — a generally flat surface markedby many low hills and ridges of sand — occupies the southwesternportion of the Schenectady sheet. Eastward of this lie the hills oftill in the town of Niskayuna which, however, are largely coveredby blown sand. Farther to the east and south of the Mohawk anarea of sandy clay broken by hills of till and dissected by streamsextends to the eastern boundary of the sheet. On the eastern sideof the sheet a broad and unbroken area of sands extends from theMohawk channel northward to the Round lake depression. Northof the depression the sands again appear forming a plain lying be-tween the Round lake
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