Report of Field Work done in Utah

	for the Carnegie Museum for the year ending

	March 1, 1921



	In the annual report for 1920 it was stated that the work for the past year had been principally confined to the part of the Dinosaur Quarry called the Eastern Extention [sic]. During the last year, March 1920 to Mar. 1921, operations at the Quarry have been confined, exclusively, to this section. The bottom of the cut in this area was two or three feet lower than that of the Old Quarry.

	At the close of the previous year the larger part of the bone-layer had been removed for a distance of about one hundred feet eastward of the Old Quarry. During the year just past, the removal of the bone-bearing layers was continued eastward until the bottom of the cut was intersected by the decending [sic] ragged line of the out crop. Near the eastern portion of this triangular area there were portions of at least five skeletons, two or three of which could not be completely uncovered in the cut at this depth. Excavation was therefore begun from the eastward, ten feet below the level of the previous cut. This lower excavation soon exposed a portion of skeletons of Stegosaurus and of a Sauropod Dinosaur.

	The skeleton of Stegosaurus was near the bottom of the new cut. It was traced westward to the pelvis and then to about the seventh dorsal from the sacrum where it was seen to be sharply flexed and was apparently turning back to the eastward. The spinal column shows no break from the end of the tail to where tracing was discontinued. The pelvis was apparently complete and articulated. The vertebral formula of Stegosaurus is not certainly known but probably there are only about twenty remaining vertebrae to be uncovered.

	We had already gone below the level of the cut in prospecting the skeleton and it was seen that it could not be removed properly and economically without again starting from the eastward at a lower level. This was done and a cut has been run westward so that work can soon be resumed on the skeleton.

	The great disadvantage under which we have worked during a part of the last year is the fact that we have been obliged to excavate for a distance of more than one hundred feet along the edge of the cliff where skeletons are incomplete on account of weathering; yet we have obtained some good material and more is nearly ready to be taken out. Fortunately we are now nearly out of this zone of weathering. At present there are articulated portions of four necks of Sauropod Dinosaurs which have been partly exposed. Their value remains to be proven.

	During the last fall and winter, on account of my knowledge of the geology of the region, I have been enabled to make several "side-trips" with almost no expense to the Museum except my salary; and though there has not been time for extensive collecting, I have made discoveries which should be of great importance to the Museum and have located several promising fields for collecting.

	A new locality for Wasatch mammals has been found not far from the Dinosaur Quarry. In fact there are a few mammalian remains in nearly all the large exposures of the Wasatch which I have examined. It seems very likely that we have new phases of this formation here.

	The Green River formation and the Wind River formation of Wyoming have been supposed to be contemporaneous, at least in part, but appear to have been deposited under different conditions. Here the Green River shales which contain insects and plants have been traced laterally into sandstones and 

sandy clays. Below this formation bands of sandstone and clays which have been called Lower Green River have been traced laterally into calcareous sandstones and sandy shales. In the former remains of crocodiles and turtles and apparently fragments of mammalian bones were discovered; and in the calcareous sandstones of the latter bones of a small mammal were found.

	As I suggested to the Director two or three years ago, the Wind River probably is represented here.

	The Green River shales are rich in fossil insects and a half dozen or more species of larvae, sometimes in countless numbers which darken the rocks, are abundant in places. Some of these are large and some almost microscopic in size.

	A few days ago I discovered in the Green River shales, a ledge of thin-layered sandstone which breaks into large slabs and which contains the most perfect and beautiful impressions of leaves. A large collection could be made in a short time, and as the Green River flora (I believe) is little known, I would suggest that a large collection be made and that the material be studied by your efficient botanist. The specimens are finer and more complete in some ways than those of the supposed Oligocene near Missoula, Mont. Some of the large maple and sycamore leaves, I consider the most attractive show-specimens that I have seen.



Yours sincerely,

Earl Douglass