BEAVER-DAMS AS GEOLOGIC AGENTS.
BEAVER-DAMS AS GEOLOGIC AGENTS.
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海狸水坝作为地质因素。
DOI：
10.1126/science.88.2292.523
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发表时间：
1938
期刊：
影响因子：
56.9
通讯作者：
W. J. Schoonmaker
中科院分区：
文献类型：
--
作者：
R. Ruedemann;W. J. Schoonmaker
在绘制首都区的塞胡勒维尔、科霍斯和特洛伊四角区以及最近的卡茨基尔四角区的地图时，资深作者有机会观察到各种宽阔平坦的冲积平原，这些平原提供了丰富的农田，其面积与目前排干它们的布鲁克斯完全不成比例。一个典型的例子是特洛伊东部伦斯勒高原脚下的一个长长的、完全平坦的山谷，南北延伸9英里，宽四分之一到半英里。毫无疑问，这个部分“死亡山谷”的起源是冰川融水，正如银行上的梯田痕迹所表明的那样;但现在它被四条不同的小溪所排水，Tomhannock向北流动，Quackenkill向南流动，Poestenkill在中间斜穿过，
DISCUSSIONBEAVER-DAMS AS GEOLOGIC AGENTS IN the mapping of the Sehuylerville, Cohoes and Troy quadrangles of the Capital District and more re-cently of the Catskill quadrangle, the senior author had occasion to observe various broad and flat alluvial plains, affording rich farm-land, that in size are com-pletely out of proportion to the small brooks that drain them at present. A typical case is the long, perfectly leveled valley east of Troy at the foot of the Rensselaer plateau, extending nine miles north and south and one-fourth to one-half mile wide. The origin of this partly" dead valley" is undoubtedly from glacial meltwater, as indicated by traces of terraces on the banks; but now it is drained by four different creeks, the Tomhannock, flowing north, the Quackenkill, flowing south, the Poestenkill, crossing it obliquely in the middle, and