XO. 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 ^iluseum. 

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

 vania where, in company 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 figure 23. L. This illustrates, on a small scale, the folding to 



1-iG. 23. — Crumpled Pre-Cambrian limestone, Southern Lancaster County, 

 Pa. Photograph by Bassler. 



which the eartbs crust has been stibjected and forms a much needed 

 addition to the exhibits. Proceeding to ^'ork, I'ennsylvania. an effort 

 was made to determine the stratigra]:)hy of that area from wiiich 

 numerous Lower Cambrian fossils had been collected for tlie .Mu- 

 seum in former years. .\n idea of the gener.-d structm-e was obtained, 

 but the stratigraphic details were worked out l)\ 1 )r. Pessi-r on a 

 later trip. 



The cast front of the .\llegliany .Mountains was then visiteil liy I )r. 

 P»asslcr in an effort to (jbtain exhibition specimens illustrating fault- 



