Darley baiera (Baiera darleyensis)

Baiera darleyensis - Triassic Ginkgophyte Fossil from Victoria

Dating back to the Triassic period, Baiera darleyensis highlights the ancient origin of the Ginkgoaceae family in Australia. The species was described by Frederick Chapman in 1927 from fossil deposits located at Bald Hill, near Bacchus Marsh. These geological findings indicate that the genus flourished in humid valley environments millions of years before the rise of flowering plants.

Taxonomy

Morphology

The leaf fossils display a distinct fan-like outline with a deeply incised lamina. The division forms narrow, elongated lobes that bifurcate several times from the base to the apex. This pattern of dichotomous venation and highly divided leaves is characteristic of the extinct genus Baiera, distinguishing it from the less divided leaves of contemporary genus Ginkgoites.

Interesting facts

The discovery of this species sheds light on the Triassic recovery of vegetation in the Southern Hemisphere. Important aspects include:

  • Discovery Site: The Bald Hill locality in Bacchus Marsh is one of the premier Triassic plant fossil localities in Victoria, yielding diverse floral assemblages.
  • Classification: Named by Chapman, it stands as a classic representative of Triassic Ginkgoaceae, showcasing the persistence of these gymnosperms through major extinction events.
  • Ecological Niche: Fossil evidence suggests it formed part of a dense understory or canopy in temperate, high-moisture environments.

Geography of distribution

  • Австралия (штат Виктория, Бакхус-Марш)

Sources

  • Chapman, F. (1927). Monograph on the Triassic flora of Bald Hill, Bacchus Marsh, Victoria. Memoirs of the National Museum, Melbourne, 7, 121–155. doi:10.24199/j.mmv.1927.7.02