Pg. 23 (fig. 1), 38 (table 2), 43. Winter Water unit (informal) in Grande Ronde Basalt of Columbia River Basalt Group. Consists of 4 flows; sparsely to abundantly plagioclase phyric. Has normal magnetic polarity (in N2 magnetostratigraphic unit). Confined to southern part of Columbia Plateau. Lies above Umtanum unit (informal) and below Field Springs [Fields Spring] unit (informal); both in Grande Ronde Basalt. Age is middle Miocene.
Reference localities: (1) Winter Water Creek, a tributary to Deschutes River, along OR State Route 216, [in NE/4 sec. 4, T. 4 S., R. 14 E., Sherars Bridge 7.5-min quadrangle, Wasco Co.], northern OR; and (2) Rock Creek Canyon on OR State Route 206, in secs. 25, 35, and 36, T. 3 S., R. 22 E., Devils Gap 7.5-min quadrangle, [Gilliam Co., northern OR]. [Misprint (table 2, p. 38): 1st reference locality stated to be in sec. 14, T. 3 S. Route 216 parallels Winter Water Creek in sec. 4, T. 4 S.]
[Additional locality information from USGS historical topographic map collection TopoView; accessed September 15, 2013.]

Source: Publication.