Sep. 18 - Sunday. With Parle strolled over the collecting ground of three years ago, saw nothing particular. Paid particular attention to the Illinois horizon and the Coralline grs. The latter lies just beneath the former. Of the Illinois one our about 5 feet though the same rock with these fossils has a greater thickness. The Coralline horizon is thinner hidden lighter in color with the fossils much more distinct. The common fossils are the Turriles, cup corals and Spirifera erisus that can be seen of the Illinois grs is only a few feet in thickness. Then there is a stiff gany slope for about 30 feet to a bench or flat which I take to be the datum lines. Sep. 19. Monday Left with Jallbery for station at