Of the areas visited, the Joseph Creek and Newhykulston sites in the Chu Chua District produced a number of fossils which were examined and described by Edward Berry in 1926 Geological Survey of Canada bulletin.

A group of leaves from the Chu Chua Formation's Joseph Creek locality were described as the new species Betula parvifolia, which was noted to be "not uncommon" at the site.

[1] Three years after the initial description of the Chu Chua belutaceous species, Berry published a monographic revision of the Latah Formation of eastern Washington and Northern Idaho.

One additional leaf from Republic was placed into "Prunus rustii", a species named from Latah Formation fossils three years earlier.

[2] Seven years later, Roland W. Brown reassessed a number of fossils from across the western United States, including the Prunus rustii leaf, which he moved to Alnus corallina.

Based on the expanded series of fossils, Wolfe and Wehr concluded the taxon was a species of alder rather than birch, and renamed it Alnus parvifolia.

[11][12][10] The highlands, including the Eocene formations between Driftwood canyon and Republic, have been described as one of the "Great Canadian Lagerstätten"[13] based on the diversity, quality and unique nature of the floral and faunal biotas that are preserved.

The highlands temperate biome, preserved across a large transect of lakes, recorded many of the earliest appearances of modern genera, while also documenting the last stands of ancient lines.

[15] Greenwood et al (2016) noted Alunus parvifolia to be the most common dicot fossil of the Klondike Mountain Formation[10] and this is similarly true at Falkland where it is found in all three identified shale units, and likely was an important post-disturbance colonizer plant and nitrogen fixer.

Labandeira suggested that the oviposition was performed by Coenagrionid family damselflies, as they are found on a wide range of leaves that would have been present near the lake shore.

[21] In addition to Paleoovoidus species trace fossils, Labandeira (2002) also documented hole feeding on an A. parvifolia which he attributed as likely caused by adult Chrysomelidae beetles.