Brown elaborated on his reassignment of the original conescale, noting that the fossil did not display characters that would indicate persistent attachment to a cone such as would be seen with Picea.

Among the Allenby Formation specimens collected were several seeds, a cone scale, and a dwarf shoot with attached needles which he assigned to Pseudolarix americana.

Gooch studied a series of 183 fossils, comprising 136 winged seeds and 47 cone scales, all housed in the Burke Museum of Natural History and Culture paleobotanical collections in Seattle.

The specific epithet wehrii was chosen to honor Burke Museum Affiliate Curator of Paleobotany and Northwest School artist[6] Wesley C. Wehr, who collected over 180 of the specimens studied.

[4] In 1991, James Bassinger first reported fossils of Pseudolarix were present in the Buchanan Lake Formation mummified forest, which had first been discovered in 1985.

They addressed the suggestion made by Gooch (1992) of P. wehrii being an ancestral species, noting that fossils assignable to P. amabilis are known from older Paleoecene and late Cretaceous formations.

[12] The plant community was a mixed conifer–broadleaf forest with large pollen elements of birch and golden larch, but also having notable traces of fir, spruce, cypress, and palm.

[12] The Buchanan Lake Formation contains mummified forest outcrops near the Geodetic Hills of Axel Heiberg Island in the Canadian high arctic.

The formation preserves flood and swamp environments that occupied a narrow valley basin supplied with sedimentation from the surrounding mountains.

Republic area fossils were first reported by Joseph Umpleby (1910), based on fish collected by him near the Tom Thumb mine, and given a tentative late Miocene age.

[15] Since then, the fossil-bearing strata of the Formation have been radiometrically dated to give a current estimate of the Ypresian, the mid-stage of the early Eocene,49.4 ± .5 million years ago.