Test excavations at a series of cave and open sites near Fish Springs, Utah, generally corroborate, with some modifications, accepted placement of Late Archaic and Fremont (Sevier) groups in space and time in the Eastern Great Basin. The study provides some evidence suggesting in situ development of the Sevier/Fremont from a local Archaic base. This contrasts with earlier findings in the area and suggests that the occupational hiatus apparent in earlier tests probably results from flooding of sites below the level of Neoglacial Lake Bonneville. Subsistence data from the dry Sevier/Fremont levels of the caves suggests they were occupied in the early winter months. An extremely high abundance of pinyon nut hulls suggests that this occupation followed a pinyon harvest in the Deep Creek Mountains. The presence of numerous marsh plants such as scripus, whose rhizomes are most generally available in the spring and early summer, suggest occupation may have continued into the spring. Together these data indicate that the Sevier/Fremont groups who occupied the sites were involved in mobile collecting activities for at least a third to half of the year and that the role of cultigens in their subsistence system and the notion that they were settled horticulturalists must be seriously re-examined.