Macrofossils, mesofossils and microfossils record the vegetation that lived around a floodplain pond. Currently 12 morphotypes of leaves and approximately 50 morphotypes each of mesofossils and palynomorphs are recognized.
Angiosperms dominate all fossil assemblages both in terms of diversity and abundance.
The preserved angiosperm flowers are primarily small and several are trimerous and epigynous, although other forms are common. Many flowers have structures resembling nectaries suggesting close association with insects. Insect interactions with flowers are also suggested by the presence of coprolites containing a single species of pollen. The mesoflora at Allon has yielded the earliest members of the Fagaceae sensu lato, the first flowers from North American with Normapolles pollen in situ, as well as Actinidiaceae, Hamamelidaceae, Lauraceae and other families. The preservation of both mesofossils and microfossils also has permitted the investigation of the concordance in the composition of these assemblages and reveals that there are many taxa that are not represented in the dispersed palynoflora.