New York State Museum bulletin . ral and southern Xew York, the westernside of the Adirondacks, and southern New England. As a resultof the uplift and dissection of this great peneplain, the chief relieffeatures of the northern Atlantic coast have been produced. Anyvery satisfactory evidence for a well-developed Cretaceous pene-plain over the central and eastern Adirondacks has so far not beenobtained, and the topography of the Blue ^Mountain quadrangle doesnot throw much light upon the problem. The most probableexplanation is that the great masses of very resistant igneous rocksin the Adirond
New York State Museum bulletin . ral and southern Xew York, the westernside of the Adirondacks, and southern New England. As a resultof the uplift and dissection of this great peneplain, the chief relieffeatures of the northern Atlantic coast have been produced. Anyvery satisfactory evidence for a well-developed Cretaceous pene-plain over the central and eastern Adirondacks has so far not beenobtained, and the topography of the Blue ^Mountain quadrangle doesnot throw much light upon the problem. The most probableexplanation is that the great masses of very resistant igneous rocksin the Adirondack region favored the existence of rather numerousand prominent monadnocks which rose above only a crudely devel-oped peneplain surface. Hence it is difficult, if not impossible, tolocate remnants of the peneplain surface with any certainty. Within the Blue Mountain quadrangle, many mountain summitslie at altitudes of from 3000 to 3500 feet, with many others only alittle higher or lower. This is well shown in the large mountain. p: ^ 03 O GEOLOGY OF THE BLUE MOUNTAIN QUADRANGLE 6l group lying between Chain lakes and Long lake. Adjoining quad-rangles show the common occurrence of similar altitudes. It wouldseem, therefore, that, if at all recognizable, remnants of the oldpeneplain surface now lie somewhere betw^een 3000 and 3500 feet,altitudes higher than this representing what were the more promin-ent monadnocks. The concordance of altitudes is not very satis-factory, and so it must be admitted that the proof is by no meansconclusive. At any rate, it is quite certain that the principal valleysand depressions of the quadrangle have been carved out of v/hatwas an upraised and at least crudely developed Cretaceous peneplain. OUTLINE OF GEOLOGIC HISTORYThose interested in the natural history of the Adirondack region,but not familiar with geologic lore, might do well first to consultthe writers New York State Museum Bulletin 168 entitled TheGeological History of New York State. Thi
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