| 1. |
 |
Trap sheet in arkose under Palisade Trap, on the shore of Hudson River, four miles south of Haverstraw, Rockland County, New York, looking west. Figure 25 in US Geological Survey Bulletin 67 1890.
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ID. Darton, N.H. 1 dnh00001 |
| 2. |
 |
Contact of second Watchung trap with underlying sandstones in quarry on north side of Passaic River below Little Falls. Passaic County, New Jersey. Figure 9 in US Geological Survey Bulletin 67 1890.
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ID. Darton, N.H. 6 dnh00006 |
| 3. |
 |
Upper contact of Palisade diabase in railroad cut east of New Durham, looking north. Shows dike like attitude of the trap at its western exposure, cutting up through the Newark formation. Hudson County, New Jersey. 1902. Figure 13 in U.S. Geological Survey. Folio 83. 1902.
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ID. Darton, N.H. 12 dnh00012 |
| 4. |
 |
Contact of trap and indurated shales in entrance to West Shore Railroad Tunnel, Weehawken, Looking south Hudson County, New Jersey. Figure 22 in US Geological Survey Bulletin 67. 1890.
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ID. Darton, N.H. 13 dnh00013 |
| 5. |
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The Palisades, from the east of the Hudson, near Yonkers, Westchester County, New York. 1902. Figure 6, a sketch, in U.S. Geological Survey. Folio 83. 1902.
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ID. Darton, N.H. 14 dnh00014 |
| 6. |
 |
Lateral ascent of base of Palisade Trap across edges of strata in King's Point, looking west. Weehawken, Hudson County, New Jersey. 1888. Plate 5 in US Geological Survey Bulletin 67 1890. Basis for figure 7, a sketch, in U.S. Geological Survey. Folio 83. 1902.
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ID. Darton, N.H. 15 dnh00015 |
| 7. |
 |
Lateral ascent of base of Palisade Trap across edges of strata in King's Point, looking west Weehawken, Hudson County, New Jersey. 1888. Plate 5 in US Geological Survey Bulletin 67 1890. Basis for figure 7, a sketch, in U.S. Geological Survey. Folio 83. 1902
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ID. Darton, N.H. 16 dnh00016 |
| 8. |
 |
Lateral ascent of base of Palisade Trap across edges of strata in King's Point, looking west Weehawken, Hudson County, New Jersey. 1888. Plate 5 in US Geological Survey Bulletin 67 1890. Basis for figure 7, a sketch, in U.S. Geological Survey. Folio 83. 1902
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ID. Darton, N.H. 17 dnh00017 |
| 9. |
 |
Conformable contact of basalt of the first Watchung flow on Newark sandstones below Falls of Passaic, Patterson; the sandstone forms the base of the section immediately above the retaining wall and is overlain by massive bedded lava with fine columnar basalt on top. Passaic County, New Jersey. 1890. Figure 16 in U.S. Geological Survey. Folio 83. 1902; figure 29 in U.S. Geological Survey. Folio 157. 1903; figure 8 in U.S. Geological Survey. Bulletin 67. 1890.
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ID. Darton, N.H. 22 dnh00022 |
| 10. |
 |
Fault in rear of Calvert Street near Zoological Park, terrace gravel and loam on gneiss, looking north; east side had dropped about 2 feet. Washington, District of Columbia. 1901. Plate 6-B, in U.S.Geological Survey Professional paper 217. 1950.
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ID. Darton, N.H. 79 dnh00079 |
| 11. |
 |
Plateau gravel (Pliocene?) on Calvert formation (Miocene): Arkose of Potomac group just below. Tunlaw Road north of Calvert Street, on line of 38th Street. Washington, District of Columbia. 1894. Plate 3-A, in U.S.Geological Survey Professional paper 217. 1950.
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ID. Darton, N.H. 99 dnh00099 |
| 12. |
 |
Vertically jointed clay of Raritan formation in wave-cut cliff, Worton Point, Kent County, Maryland. 1912. Plate 1 in U.S. Geological Survey. Folio 204. 1916.
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ID. Darton, N.H. 206 dnh00206 |
| 13. |
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The Lafayette plain near Richmond. Henrico County Virginia. 1906. Plate 2-A in U.S. Geological Survey. Bulletin 483. 1911.
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ID. Darton, N.H. 209 dnh00209 |
| 14. |
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West slope of Shockoe Creek valley, near intersection of Twelve and Leigh Street, looking southwest. Calvert formation capped by Lafayette. Richmond (city) County Virginia. 1906. Plate 3-A in U.S. Geological Survey. Bulletin 483. 1911.
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ID. Darton, N.H. 211 dnh00211 |
| 15. |
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Contact of Calvert and Aquia formations in gully at Twelfth and Leigh Streets, looking south. Richmond (city) County Virginia. 1906. Plate 4-B in U.S. Geological Survey. Bulletin 483. 1911.
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ID. Darton, N.H. 212 dnh00212 |
| 16. |
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Calvert formation in cut near Eleventh and Turpin Street, diatom-bearing clays, Richmond (city) County Virginia. 1906. Plate 4-A in U.S. Geological Survey. Bulletin 483. 1911.
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ID. Darton, N.H. 213 dnh00213 |
| 17. |
 |
Matawan formation containing large seal-shaped concretions on south shore of Gibbon Island, concretions derived from the rock in the bluff by weathering lie along the beach. There is a specimen of Exogyra costata just below the concretion in the bluff. George O. Smith at right. Ann Arundel County, Maryland. 1912. Plate 5 in U.S. Geological Survey. Folio 204. 1916.
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ID. Darton, N.H. 215 dnh00215 |
| 18. |
 |
Bluff of clay marl of Matawa formation underlain by Magothy formation near Grove Point, the ledge is undercut by the removal of loose laminated sand of the Magothy formation by marine erosion. Cecil County, Maryland. 1912. Plate 4 in U.S. Geological Survey. Folio 204. 1916.
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ID. Darton, N.H. 219 dnh00219 |
| 19. |
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Harpers Ferry National Historic Park, West Virginia. The Potomac River near Harpers Ferry. Planation of rock ledges in the river bed.
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ID. Darton, N.H. 235 dnh00235 |
| 20. |
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Harpers Ferry National Historic Park, West Virginia. Junction of the Shenandoah and Potomac Rivers at Harpers Ferry.
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ID. Darton, N.H. 236 dnh00236 |
| 21. |
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Harpers Ferry National Historic Park, West Virginia. The Shenandoah River near Harpers Ferry.
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ID. Darton, N.H. 237 dnh00237 |
| 22. |
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Deadwood sandstone lying on Algonkian schists in Deadwood. Lawrence County, South Dakota. Circa 1900. Plate 13-B in U.S. Geological Survey. Professional paper 32. 1905, plate 5 in U.S. Geological Survey. Professional paper 65. 1909.
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ID. Darton, N.H. 256 dnh00256 |
| 23. |
 |
Deadwood formation in northern part of Deadwood, view showing thick mass of regularly bedded sandstone in middle of formation, looking northeast. Lawrence County, South Dakota. Circa 1900. Plate 13-A in U.S. Geological Survey. Professional paper 32. 1905, plate 14 in U.S. Geological Survey. Folio 219. 1925.
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ID. Darton, N.H. 257 dnh00257 |
| 24. |
 |
Typical deep well rig at deep boring, Rosebud Indian Reservation, 25 miles northeast of Agency. Todd County, South Dakota. Circa 1900. Plate 61-B in U.S. Geological Survey. Professional paper 32. 1905.
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ID. Darton, N.H. 271 dnh00271 |
| 25. |
 |
Terrace gravel and loam on gneiss. N. Street near 24th Street, NW. Much of the older part of city is built on the river terrace deposits. To the east these deposits lie on sand and clay of the Potomac group. Washington, District of Columbia. 1895. Plate 5-A, in U.S.Geological Survey Professional paper 217. 1950.
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ID. Darton, N.H. 278 dnh00278 |