. Annals of the New York Academy of Sciences. Science. 18 ANNALS NEW YORK ACADEMY OF SCIENCES along lines of faulting give strong character to a map of the Adirondacks. Tectonic valleys characterize the New York City region where the Man- hattan Street depression, the Dyckman Street cross valley (Fig. 14), the Harlem Kiver, and some of the notches of the Palisades owe their position to ancient lines of dislocation. At Saratoga the mineral springs are believed to follow similar lines of displacement. The offsetting and overlapping of ridges resulting from faulting, planation, and later dis- sec
. Annals of the New York Academy of Sciences. Science. 18 ANNALS NEW YORK ACADEMY OF SCIENCES along lines of faulting give strong character to a map of the Adirondacks. Tectonic valleys characterize the New York City region where the Man- hattan Street depression, the Dyckman Street cross valley (Fig. 14), the Harlem Kiver, and some of the notches of the Palisades owe their position to ancient lines of dislocation. At Saratoga the mineral springs are believed to follow similar lines of displacement. The offsetting and overlapping of ridges resulting from faulting, planation, and later dis- section of a region of dipping alternating resistant and non-resistant beds is illustrated in the Hanging Hills of Meriden and other trap ridges of Connecticut (Fig. 18).. Geo I. Column Palisade 7rap Triass/c Manhattan Jeh. fowood vrt/ham gn. northern New York City Fig. 14.—Diagrammatic representation of the essential relief features of northern New York City, with cross-sections showing the underground structure The resistent character of the Fordham gneiss, the Manhattan schist, and the Pali- sade trap is noteworthy, as is also the development of the valleys upon the limestone belts. The letters on the diagram refer to the following features : B, Bronx River; B P, Bronx Park; D, Dyckman street cross valley ; F, Fordham Heights; F G, Fort George Heights ; F W, Fort Washington Heights ; F L, Fort Lee ; H. Highbridge ; Ha, Harlem River; Hud, Hudson River; P, Palisades; W, Washington Bridge. Folded Mountains.—When the presentation of folded mountains is introduced the teacher may be proud that he can cite examples from this region unexcelled in the entire world. Around Kingston and Catskill the study may be taken up in miniature, but with all the essentials of form. The Little Catskill Mountains make it possible for one in a half day's journey to see an anticlinal, synclinal, and monoclinal mountain and an anticlinal, synclinal, and monoclinal valley, all in close juxt
Size: 2121px × 1178px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
