[1] In the descriptive paper naming Concavistylon Manchester et al. reported that radioisotope dating of plagioclase crystals collected by Robert Rosé from the fossiliferous horizon of the Moose Mountain flora had been performed.

Using crystals obtained from tuffaceous sandstones, Argon–argon dating provided an age of 14.91 ± 0.23 Ma placing the flora as Middle Miocene Langhian stage.

[2] Study of the fossil by paleobotanists Steven Manchester, Kathleen Pigg, and Melanie DeVore, resulted in the description of Concavistylon kvacekii published 60 years later in 2018.

The new species was from the older Ypresian age Klondike Mountain Formation of northeastern Washington and McAbee Fossil Beds in central British Columbia.

[4] The description of Paleocene trochodendraceous fossils from Wyoming and a phylogenetic analysis of two living and four extinct genera indicated that Concavistylon was not monophyletic.