Alpine, April 7 - 1926 Wednesday. Spent the day 3-4 miles W. of Marathon to collect fossils only the "Tesnus" and all that I saw showed that this Tesnus = Sapland and in all probability the whole of the Sapland. First collected along the Alpine-Marathon road about 3½ miles S.E. of Marathon. The shales are well exposed in the road ditch in a horizontal attitude and embraced many green shales with few fossils then beds of limestone barely the fossils, but a few more on the dark shale slope above. It's the Sapland fauna and ph. R.P., Bap. Then crossed country to the D. P. R. R. cut at mile post 580. Here the shales are vertical, shales, conglomerates (a bowl de bul. of small rounded rocks) and limey sandstones. With few fossils: *Spirifer* cammeratus and *Fusulina cylindrica*. On the south dump of this 580 mile post cut there is a limestone Hreda reef which Blanchard erected for one some fossils. Keyte is said to have many more. This large Hreda came out of the railway cut. Then went to the hill about 1/8 mile farther S.W. from mile post 580 to see the unconformity discovered by me two years ago. After much work I can now conclude that this angular unconformity is due to upwarping and thrusting producing an apparent unconformity. In the vertical strata beneath the unco-