. Annual report. 1st-12th, 1867-1878. he banks of Beaver Creek; the entire distanceis about 60 or 80 feet. The origin of this singular geological formationwas evidently due to the gradual solution of the limestone by the waterhaving at some time or other been charged with some acid gases ormineral ingredients. The settlement within this natural enclosure wasno doubt a retreat in times of danger, as the sloping surface recedingfrom it is covered with ruins of former structures, over the remains ofwhich, and throughout considerable surface beyond, the soil is coveredwith numerous fragments of be
. Annual report. 1st-12th, 1867-1878. he banks of Beaver Creek; the entire distanceis about 60 or 80 feet. The origin of this singular geological formationwas evidently due to the gradual solution of the limestone by the waterhaving at some time or other been charged with some acid gases ormineral ingredients. The settlement within this natural enclosure wasno doubt a retreat in times of danger, as the sloping surface recedingfrom it is covered with ruins of former structures, over the remains ofwhich, and throughout considerable surface beyond, the soil is coveredwith numerous fragments of beautifully glazed and incised and carnelian flakes, weapons, and other remains occur in consid-erable quantities. The land surrounding this locality is excellect foragricultural purposes, and it appears to have been at one time nndercultivation. Wherever one turns scattered pieces of pottery are visible,giving either proof of a very large settlement, or one that lasted for manyyears. U. S. Geological Survey. Plate Cliff Fortress. PART IV PALEONTOLOGY AND ZOOLOGY. 470 REPORT OF LEO LESQUEREUX, REMARKS ON SPECIMENS OE CRETACEOUS AND TERTIARYPLANTS SECURED BY THE SURVEY IN 1877: WITH A LISTOF THE SPECIES HITHERTO DESCRIBED. By Leo Lesquereux. Part I.—REMARKS ON SPECIMENS SECURED IN 1877. Until the end of the season of exploration of the Geological Survey ofthe Territories in 1877, few specimens of fossil plants had been receivedfor examination. Some were sent by Passed Assistant Engineer H. , United States Navy, from the Cretaceous strata at the footof the Rocky Mountains, near Morrison, Colo., and a few by Rev. ArthurLakes, from the Eocene of Golden. These have been examined andfigured, but they are too few in number for a separate report. Near the end of the past year I received from the Upper Tertiary ofFlorissant an immense amount of specimens, mostly obtained by H. Scudder. The examination of these materials is begun, butthe materi
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