Small tools from the Olorgesailie Acheulian sites: scraper, nosed and beaked forms, and a notched piece. Most artifacts, both large and small, are made of lavas from the vicinity of the lake basin. This selection is of obsidian, quartz and chert which were presumably brought in from more remote areas.
Excavations nearby disclosed the existence of a dense patch of artifacts that had not yet been cut into by erosion. This patch has a diameter of 12 - 15 m. and contains more than a tone of stone, which was apparently imported by early man. This is the site of DE/89 horizon B. The material has been concentrated by current action in part of the seasonal streambed in which the early humans camped.