NO. 2 



SMITHSONIAN EXPLORATIONS, I918 



23 



cemented together and forming a limestone mass of such interest 

 that several large pieces were dug" out for exhibition in the Museum. 

 Dr. Bassler then proceeded to the Lancaster \'alley of Pennsyl- 

 vania where, in companv with Dr. Resser, some days were spent 

 studying" the stratigraphy of the valley, and collecting" minerals and 

 fossils. Working' in the region of highly metamorphosed rocks in 

 southern Lancaster County, they were fortunate enough to secure 

 intact the large mass of finely banded, crinkled limestone shown 

 in fig"ure 23, L. This illustrates, on a small scale, the folding to 



Fig. 2^. — Crumpled Pre-Cambrian limestone, Southern Lancaster County, 

 Pa. Photograph by Bassler. 



which the earth's crust has been subjected and forms a much needed 

 addition to the exhibits. Proceeding to York, Pennsylvania, an elTort 

 was made to determine the stratigraphy of that area from which 

 numerous Lower Cambrian fossils had been collected for the Mu- 

 seum in former years. An idea of the general structure was obtained, 

 but the stratigraphic details were worked out by Dr. Resser on a 

 later trip. 



The east front of the Alleghany ^Mountains was then visited by Dr. 

 Bassler in an efifort to obtain exhibition specimens illustrating fault- 



