CONCRETIONS 453 



1041. Concentric weathering in shale, Beaver, Pennsylvania. 



1106. Cone-in-cone concretion in Pierre shales near Hot springs, South Dakota. 



1280. Concretions in Laramie sandstone, Weston county, Wyoming. 



Contacts of Igneous Rocks (near views only) 



452. Trap sheet on underlying shales, Hartford, Connecticut. 

 659. Basic granite and acid granite, Butte, Montana. 



721. Base of first Watchung trap sheet in gorge of Passaic river at Paterson, New 



Jersey. 



722. Lateral ascent of base of palisade trap across shale at Kings point, Weehaw- 



ken, New Jersey. 



723. Cross-section exposure of base of palisade trap sheet with Newark shales, 



Weehawken, New Jersey. 



Creep Strle 

 1009, 1010. On roofing slate, Bangor, Pennsylvania. 



Cross-bedding 



154. Bedding and cross-bedding in Walnut canyon, Arizona. 



155. Navajo church near fort Wingate, New Mexico. 



520. Coal Measures sandstone, Bedrock , Marion county, Iowa. 



529. Leclaire limestone, obliquely bedded below, horizontally bedded above. 



Sugar Creek lime quarries, Cedar county, Iowa. 



530. Oblique bedding in Leclaire limestone, half a mile south of Leclaire, Iowa. 

 541. In sandstone, Saint Louis, Bellefontaine, Makaska county, Iowa. 



677, 678. Cretaceous sandstone, Teton county, Montana. 



679. Conglomerate sandstone lens in Brule clay, 6 miles south from Gering, Ne- 

 braska. 



696. Dakota sandstone, Bennett, Nebraska. 



755. Cross-bedding in sand kame, Lockport, New York. 



780. In Medina sandstone, in quarry near Lewiston, New York. 

 1103. Oligocene cross-bedded gravel, south of Fairburn, South Dakota. 

 1124. In Sioux quartzite, Sioux Falls, South Dakota. 



Crystals in Rocks 



251, 252. Quartz in lava near Snag lake, California. 



297. Porphyrinic granite near Granite lake, Tuolumne county, California. 

 1397. Gneiss, Lawrence and West Andover, Massachusetts. 



Deltas 



10. Delta in Gastineau channel, at Juneau, Alaska. 



20. Yahtse river from above ice-tunnel, Alaska. 



26. Alluvial fan of the Yahtse, Alaska ; 6 by 8 inches. 



51. Delta of subglacial stream, Muir glacier, Alaska. 



111. Mouth and delta of Chettyna river, mount Blackburn, Alaska. 



1233. Delta of Chelan river at its junction with the Columbia, Washington. 



LXV— Bui.r,. Gkoi,. Soc. Am., Vor,. 13. 1901 



