12 SMITHSONIAN INSTITUTION 



near Mount Eagle and to nearly 250 feet at Lock Haven. To the east 

 and southwest the limestone thins to 35 feet at Danville and to a few 

 inches near Mandatta. Southwest of this place on the Juniata River, 

 about 30 miles northwest of Harrisburg, the formation is composed 

 of a thin calcareous layer and about 15 feet of shale. Traced east- 

 ward from here the lime content disappears and the Tully fauna has 

 been found in shale and sandstone in eastern Pennsylvania. During 

 this investigation a number of good collections were made from this 

 little-known formation and also from the underlying Hamilton rocks. 

 New York and Canada. — This trip was undertaken with Dr. Josiah 

 Bridge of the United States Geological Survey. The purpose was 

 threefold : to study Ordovician (Chazyan) rocks at their type section, 

 Chazy, N. Y. ; to collect fossils from the Mystic conglomerate of 

 southern Quebec ; and to study type fossils from the Chazy formation 

 in the National Museum of Canada at Ottawa, Ontario. 



1. The Chazy formation is well exposed at its type section in 

 Chazy, N. Y., which lies just below the Canadian border on the shores 

 of Lake Champlain. These rocks are also well exposed at Crown 

 Point, N. Y. In fact the walls of the old French fort and those of 

 the later English fort at Crown Point were built of blocks of this 

 limestone quarried from nearby ledges. 



At Chazy the rocks are mostly massive limestones broken into 

 blocks by faults. Nearly the entire sequence is present at Chazy and 

 can be seen just west of the village. Fossils are common, particularly 

 a large flat snail known as Maclurca. Collections were made at Chazy 

 and also at Crown Point. 



2. From Chazy the party moved to Bedford in southern Quebec. 

 Here occur outcrops of a peculiar conglomerate made of large boulders 

 of limestone containing fossils of different geologic ages. One type 

 of boulder contains fossils related to species found farther south at 

 Phillipsburg, Quebec, and in Vermont. Another type of boulder con- 

 tains a fauna whose nearest relative is found in Newfoundland. Good 

 collections of peculiar fossils were taken from two large boulders of 

 this latter type. 



3. After two days in Bedford the party went on to Ottawa with a 

 short stop at McGill University in Montreal. Between Hawkesbury 

 and Ottawa small collections of Chazyan fossils were made in road- 

 side cuts and quarries. Two days were spent in studying type speci- 

 mens in the National Museum of Canada. On the return trip to 

 Washington a short stop was made at a large quarry on the Colgate 

 University Campus at Hamilton, N. Y., where a few fine Devonian 

 fossils were collected. 



