AND JOINTING 469 



527. Quarry in Devonian limestone, showing two parallel joints. Near Iowa City, 



Johnson county, Iowa. 



528. Columns of Saint Croix sandstone, Lane's farm, Iowa. 



556. Leelaire limestone, illustrating breaking down of cliffs along joint planes 



Near Massillon, Iowa. 

 664. Hogback, formed by upturned Cambrian sandstone. West of Townsend, 



Montana. 



769. Section of Niagara limestone, near La Salle, Niagara county, New York. 



770. Section in cut of Erie railway, Niagara falls, New York. 

 782. Quarry face in Niagara limestone, Lockport, New York. 

 793. Grouped joints in Devonian shale, Watkins glen, New York. 

 805-807. Penrhyn slate quarry, Middle Granville, New York. 

 809. Cliffs in Topmans gulf, Jefferson county, New York. 



954. Ohlinger Dam quarry, showing both dip and cleavage in Laurentian gneiss, 



near Reading, Pennsylvania. 

 957, 958. Quarries at Slatington, Pennsylvania. 



1028. Slate quarry at Bangor, Pennsylvania. 



1029. The Franklin slate quarry, Slatington, Pennsylvania. 



1035. Quarry near Bellemont post-office, Lancaster count}'-, Pennsylvania. 

 1041. Ohio river and bluff opposite Beaver, Pennsylvania. 

 1125. Palisades on Split Rock creek, South Dakota. 



1220. Cascade pass, Cascade range, Washington ; cliffs of hornblendic gneiss ex- 

 hibiting vertical jointing. 

 1222. Basin peak, Cascade range, Washington. 

 1397. Gneiss, showing foliation, Massachusetts. 



Shore Cliffs 



(See also Lake Terraces and River Terraces) 



25. Sitkagi bluffs at margin of Malaspina glacier. 

 317. Swampy island, lake Winnipeg, Manitoba. 

 32 L. Cedar lake, Saskatchewan, Northwest Territory. 

 322. Northwest shore of lake Winnipeg, Manitoba. 

 324. North side Deer island, lake Winnipeg. 

 329. The Ovens, Nova Scotia. 

 342. Conception Bay, Newfoundland. 

 358. Hicaron island, Pacific ocean. 

 598. Plum point, Calvert county, Maryland. 

 600. Wortons point, Kent county, Maryland. 

 605-609, 614. Head of Chesapeake bay, Maryland. 

 619. Long Island head, Boston harbor, Massachusetts. 

 622. Great Brewster islands, Boston harbor, Massachusetts. 



628. Mackinaw island, Michigan. 



629. Sea-cliff near Marquette, Michigan. 



630. Au Train island, lake Superior, Michigan. 



631. 633, 643. South Manitou island, Michigan. 



632. Sleeping Bear point, lake Michigan, Michigan. 

 634. North Manitou island, lake Michigan, Michigan. 



LXVII— Bult,. Geol. Soc. Am., Vol. 13, 1901 



