Author	Keating, J.M.
Year	1992
Journal	In: Duane, A.M., Pirrie, D. and Riding, J.B. (eds.), 1992: Palynology of the James Ross Island Are
Title	Palynology of the Lachman Crags Member, Santa Marta Formation (Upper Cretaceous) of northwest James Ross Island

Abstract Keating, J.M., 1992; Palynology of the Lachman Crags Member, Santa Marta Formation (Upper Cretaceous) of northwest James Ross Island. In: Duane, A.M., Pirrie, D. and Riding, J.B. (eds.), 1992: Palynology of the James Ross Island Area, Antarctic Peninsula. Antarctic Science, Volume 4,No.3: 293-304 Special Issue, September 1992. Blackwell Scientific Publications Abstract: Palynomorph assemblages from the Lachman Crags Member of the Santa Marta Formation, northwest James Ross Island, Antarctic Peninsula are described. By basis of comparison with other Southern Hemisphere localities, particularly southern Australia, an early Santonian-early Campanian age is indicated. The results broadly corroborate previous stratigraphical interpretations based on macrofaunal evidence, although the presence of a significant thickness of Santonian strata, not previously recognized, is suggested. The dinoflagellate cyst floras allow the recognition of the local equivalents of the Australian Odontochitina porifera, Isabelidinium cretaceum, Nelsoniella aceras and Xenikoon australis Interval Zones. Some recycling of mid Cretaceous (and possibly Late Jurassic) taxa is also indicated. The miospore flora is composed of relatively long-ranging species, although the local appearance of certain taxa may be of stratigraphical significance. Ranges recorded support previous interpretations of heterochroneity in Southern Hemisphere floras. The palynoflora comprises 76 dinoflagellate cyst, 40 miospore and 7 acritarch, prasinophyte and chlorophyte taxa. Six undescribed species of dinoflagellate cyst are recorded and placed in open nomenclature.