Oct 27, Monday, Atoka. Started at 8.30 A.M. walk 5 miles to a road Cutting just beyond a bridge over a small stream. Here Tallihini chalk and shales is well exposed and from graptolites now collected. They are of the Mos- sourislike horizon. Also got three species of brachiopods, making a very large Paterula. We then went further north to the M.C. and T. in limestone Ridge. tallark quarries at Chockie. The railway has been operating these quarries for 20 years and have taken out about 100 feet of thickness & lie for nearly one-half mile in length. The strata dip stuff to the southeast 75°, The thickness is about 125 feet. Towards the base the limestone crumbles into thin beds and all the fossils gather are of those lower strata. All are small and 9/10s are byssus. Otherwise the fossils are much broken and crushed. Harris (Oklahoma Survey Bulletin no 23) gives the following section of the Chockie quarries. Beginning at the top the strata are (T.1 N., R.12 E.) Limestone CoSlite Chert (I should say a dense hard cl) Argillaceous Hue li that crumbles yellow and is composed of comminuted small bris} This is the horizon that gave us are the fossils frag sand 43 " 70" ft. 3 " 15 " 131"/2