Republica weatbrooki is known from a single location in the Eocene Okanagan Highlands, an outcrop of the Ypresian Klondike Mountain Formation in Republic.

[3] Republica weatbrooki was identified from only the type specimen, the holotype, number SR 06-59-08, which is a compression fossil preserved in the Stonerose Interpretive Center paleoentomological collection.

The placement was based on the angle and thickened appearance in the quadrangle cells distal wall, densely reticulate venation, plus a smoothly "S"-curved CuA vein, which match Euphaeidae while being contrary to the family Zacallitidae.

[1][5] Modern Euphaeidae species are found in the Australasian, Indomalayan, and Palearctic biogeographic realms, while the known fossil record restricted to Europe and North America.

[7] The pollen flora has notable elements of birch and golden larch, and distinct trace amounts of fir, spruce, cypress, and palm.

[8] Wolfe and Tanai (1987) interpreted the forest climate to have been microthermal,[9][6] having distinct seasonal temperature swings which dipped below freezing in the winters.

However, further study has shown the lake system was surrounded by a warm temperate ecosystem that likely had a mesic upper microthermal to lower mesothermal climate, in which winter temperatures rarely dropped low enough for snow, and which were seasonably equitable.