[1] The genus was described from a series of isolated fossil leaves in shale from an early Eocene[2] location in southern British Columbia.

[1] Stonebergia has only been identified from one location in the Eocene Okanagan Highlands, the type locality "One mile Creek" exposure of the Allenby Formation near Princeton, British Columbia.

The Allenby formation sediments are interpreted as preserved river lake and wetlands systems,[3] with a surrounding mountain environment.

The specimens were studied by the paleobotanists Jack A. Wolfe of the United States Geological Survey, Denver office and Wesley C. Wehr of the Burke Museum.

[1] In their type description they note the etymology for the generic name Stonebergia is in honor of Margaret Stoneberg[4] from the Princeton District Museum for her support and encouragement of Wolfe and Wehr.