Bulletin - New York State Museum . e thoseevidences de la personne-ressource à laquelle les preuves de l'existenceof deltas préglaciaire ne doit jamais dépendre. D'autres modifications post-glaciaire 14() NEW YORK STATE MUSEUM sont vus sur la surface du delta dans les dunes de sable qui havethere développé. Le long de la frontière sud-est du delta, le terrain descend une offto terrasse argileux situé entre 250 et 280 pieds d'altitude.Il est bien exposé au lieynolds Corners [voir pi. 13]. Le slopefrom la 350 delta pied j)lain à cette terrasse inférieure de FortEdward vers le sud coïncide étroitement avec la limite entre les Calc

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Bulletin - New York State Museum . e thoseevidences of the ice contact on which the proof of the existenceof preglacial deltas must ever depend. Other postglacial changes 14() NEW YORK STATE MUSEUM are seen on the surface of the delta in the sand dunes which havethere developed. Along the southeastern border of the delta the land drops offto a clayey terrace lying between 250 and 280 feet in elevation.It is well exhibited at lieynolds Corners [see pi. 13]. The slopefrom the 350 foot delta i)lain to this lower terrace from FortEdward southward coincides closely with the boundary betweenthe Calciferous-Trenton limestones and the Hudson rivei* shaleswhich lie on the east of them. But the immediate origin of theslope appears to be due to erosion taking place subsequent tothe formation of the 350 foot delta. This lower terrace correspends in position with a tilted water plane of a glacial lakewhose outlet on the south, as is shown on plate 28, was in the PALMERTOWW ^CV- r ^ MT. , - - A - TERRACE HUDSON ^ ^ J c RIVER a ::^^:d. Fig. 20 Profile of the terraces and delta levels from the base of Palmertown mountainto the Hudson river, a. The glacial terrace; b, the broader terrace at 400 feet; c, thedelta of the Hudson; d, the claj^ terrace, a part of the channel of the stream which flowedthrough the Coveville outlet old channel back of Schuylerville which falls into the Hudsongorge at Coveville. Below the level of this terrace is the old channel continuingthe Hudson gorge by way of the Wood creek valley to LakeChamplain, the evident path of a river which as I shall hope toshow later in this report drained a glacial lake in the Champlainvalley into the Hudson gorge. East of this channel is a branchat a somewhat higher level perhaps earlier occupied by the samestream before that nearer Fort Edward was so deeply excavated. The above diagram, figure 20, is intended to show by an eastand west profile tlie successive terrace and delta levels of theFort Edward district, down to the

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