^72 PRQCEEDTNGS OP THE NEW YORK MEETING 



1764. Post-glacial anticline, FTopkins creek, Niagara county, New York. Tlie dis- 



])lacement of the rocks is accompanie'd by a superficial ri(l<<e traversinj^ an 

 alluvial terrace. Gilbert, 1898. 



1765. Section of Niagara limestone. Cook's (juarry, near La Salle, Niagara county, 



New York. Shows structure described V:)y James Hall, Geology of Fourth 

 District of New York, pages 93 and 94. Gilbert, 1898. 



1766. Section in cut of Erie railway, Niagara falls. New York. Shows structure 



described by James Hall, Geology of Fourth District of New York, pages 

 93 and 94. Gilbert, 1898. 



1767. Weathering of Niagara limestone by solution. A joint face exposed in quar- 



rying southwest of Middleport, New York. Gilbert, 1898. 



1768. Weathering of Niagara limestone by solution ; old quarry southwest of Mid- 



dleport, New York. Gilbert, 1898. 



1769. Unconformity by erosion. Sandstones and shales of the Medina formation, 



Niagara gorge. Gilbert, 1898. 



1770. Isolated limestone mass at base of Niagara shale, containing '• transition 



fauna" of Ringueberg. Gilbert, 1898. 



1771. Section of ripple-mark on Medina sandstone, Lockport, New York. Fi-om 



crest to crest, 23 feet; depth of trough, 29 inches. Gilbert, 1898. 



1772. Flagstone in court-house yard, Elyria, Ohio. Shows reticulated ripple-marks. 



Gilbert, 1898. 



1773. Trough of large ripple-mark in Medina sandstone, Niagara gorge, New York. 



Gilbert, 1898. 



1774. Crest of large ripple-mark in Medina sandstone. Quarry near Lewiston, 



New York. Gilbert, 1898. 



1775. Crest of large ripple-mark in Medina sandstone. Quarry in Lockport, New 



York. Gilbert, 1898. 



1776. Diverse cross-bedding associated with large ripple-marks in Medina sand- 



stone. Quarry near Lewiston, New York. Gilbert, 1898. 



1777. Quarry face ia Medina sandstone. Lockport, New York. Gilbert, 1898. 



1778. Quarry face in Niagara limestone. Lockport, New York. The joint face 



shows weather fracture. Gilbert, 1898. 



1779. Shore of lake Ontario at Wilson, New York. Train of shore drift from 



right, being arrested by bew-pin, begins to accumulate and partly protects 

 bluff from wave attack. Dearth of shore drift under lee of pier favoi-s 

 wave attack ; bluff eaten back 45 feet. Bluff contains two tills and cover 

 of laminated clay, a deposit from lake Iroquois. Boulder pavement at 

 top of lower till, indicated by arrow. Gilbert, 1898. 



Size, 6 by 7i inches. Twenty-nine photographed by N. H. Darton, 1898 



1780 (424). Triassic conglomerate-sandstone. Garden of the Gods, Colorado. By 



N. H. Darton, 1898. 



1781 (429). Pikes peak through the gateway of the Garden of the Gods, showing 



Jura-Trias beds. By N. H. Darton, 1898. 



1782 (430). Cathedral spires. Garden of the Gods, Colorado. By N. H. Darton, 



1898. 



1783 (434). Titanotherium sands east of Adelia, Sioux county. South Dakota. By 



N. H. Darton, 1898. 



