Plant macrofossil evidence for the environment associated with the Riversleigh fauna
Greg R. Guerin A C and Robert S. Hill A BA Centre for Evolutionary Biology and Biodiversity, School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA 5005, Australia.
B South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.
C Corresponding author. Email: greg.guerin@adelaide.edu.au
Australian Journal of Botany 54(8) 717-731 https://doi.org/10.1071/BT04220
Submitted: 20 December 2004 Accepted: 22 June 2006 Published: 29 November 2006
Abstract
Fossil plant organs from probable Oligocene nodules at the Dunsinane Site at Riversleigh, Queensland, were studied. The deposit consists of a low diversity assemblage of reproductive and vegetative organs dominated by a single taxon of Casuarinaceae. The species of Casuarinaceae has affinities with Casuarina and Allocasuarina in having more four teeth per whorl on the photosynthetic branchlets and stomata hidden in deep furrows filled with trichomes, and as such represents the earliest known record of sub-family Cryptostomae. The species is described as Cryptostomiforma quinata gen. et sp. nov. A leaf species is assigned to Alectryon (Sapindaceae) on the basis of the anatomy of abaxial cuticular features. In particular, the morphology is indistinguishable from extant A. affinis, a species currently endemic to New Guinea. Organs with possible affinities to Rubus or Capparis were examined. The assemblage is interpreted as a possible vegetation mosaic, containing both deciduous vine thickets and sclerophyllous habitats. No evidence for the presence of rainforest was found and the fossils are not consistent with extensive lowland tropical rainforest.
Acknowledgments
We thank Mike Archer, Rick Arena, Jo Shrapnel, Yvonne Menadue, David Christophel, Leonie Scriven, Richard Barnes, John Conran, staff of Adelaide Microscopy, staff of the Plant Biodiversity Centre (SA State Herbarium), David Symon and The Australian National Herbarium, Canberra. The Australian Research Council provided funding for the project.
Andrews P, O’Brien EM
(2000) Climate, vegetation, and predictable gradients in mammal species richness in southern Africa. Journal of Zoology 251, 205–231.
| Crossref | GoogleScholarGoogle Scholar |
Archer M,
Godthelp H,
Hand SJ, Megirian D
(1989) Fossil mammals of Riversleigh, northwestern Queensland: preliminary overview of biostratigraphy, correlation and environmental change. Australian Zoologist 25, 29–65.
Arena DA
(1997) The palaeontology and geology of Dunsinane Site, Riversleigh. Memoirs of the Queensland Museum 41, 171–179.
Boles WE
(1997) Riversleigh birds as paleoenvironmental indicators. Memoirs of the Queensland Museum 41, 241–246.
Campbell JD, Holden AM
(1984) Miocene casuarinaceaen fossils from Southland and Central Otago, New Zealand. New Zealand Journal of Botany 22, 159–167.
Christophel DC
(1980) Evolution of the Australian flora through the Tertiary. Plant Systematics and Evolution 162, 63–78.
| Crossref | GoogleScholarGoogle Scholar |
Christophel DC,
Scriven LJ, Greenwood DR
(1992) The Middle Eocene megafossil flora of Nelly Creek (Eyre Formation), Southern Lake Eyre Basin, South Australia. Transactions of the Royal Society of South Australia 116, 65–76.
Coetzee JA, Praglowski J
(1984) Pollen evidence for the occurrence of Casuarina and Myrica in the Tertiary of South Africa. Grana 23, 23–41.
Creaser P
(1997) Oligocene-Miocene sediments of Riversleigh: the potential significance of topography. Memoirs of the Queensland Museum 41, 303–314.
Dickison WC
(1975) Studies on the floral anatomy of the Cunoniaceae. American Journal of Botany 62, 433–447.
| Crossref | GoogleScholarGoogle Scholar |
Dickison WC
(1984) Fruits and seeds of the Cunoniaceae. Journal of the Arnold Arboretum 65, 149–203.
Dilcher DL,
Christophel DC,
Bhagwandin HO, Scriven LJ
(1990) Evolution of the Casuarinaceae: morphological comparisons of some extant species. American Journal of Botany 77, 338–355.
| Crossref | GoogleScholarGoogle Scholar |
Frakes LA
(1997) Grossplots: a method for estimating the temperature state of the Earth and of Australia, Cretaceous to Middle Miocene. Australian Journal of Botany 45, 359–372.
| Crossref | GoogleScholarGoogle Scholar |
Greenwood DR
(1996) Eocene monsoon forests in central Australia? Australian Systematic Botany 9, 95–112.
| Crossref | GoogleScholarGoogle Scholar |
Greenwood DR,
Haines PW, Steart SC
(2001) New species of Banksieaeformis and a Banksia ‘Cone’ (Proteaceae) from the Tertiary of central Australia. Australian Systematic Botany 14, 871–890.
| Crossref | GoogleScholarGoogle Scholar |
Hill RS, Christophel DC
(2001) Two new species of Dacrydium (Podocarpaceae) based on vegetative fossils from the Middle Eocene sediments at Nelly Creek, South Australia. Australian Systematic Botany 14, 193–205.
| Crossref | GoogleScholarGoogle Scholar |
Jacobs M
(1964) The genus Capparis (Capparaceae) from the Indus to the Pacific. Blumea 12, 285–541.
Jordan GJ, Hill RS
(1996) The fossil record of the Epacridaceae. Annals of Botany 77, 341–346.
| Crossref | GoogleScholarGoogle Scholar |
Lange RT
(1978) Carpological evidence for fossil Eucalyptus and other Leptospermae (subfamily Leptospermoideae of Myrtaceae) from a Tertiary deposit in the South Australian arid zone. Australian Journal of Botany 26, 221–233.
| Crossref | GoogleScholarGoogle Scholar |
Mares MA, Ernest KA
(1995) Population and community ecology of small mammals in a gallery forest of central brazil. Journal of Mammology 76, 750–768.
| Crossref | GoogleScholarGoogle Scholar |
Martin HA
(1993) Monotoca-type (Epacridaceae) pollen in the Late Tertiary of southern Australia. Australian Journal of Botany 41, 709–720.
| Crossref | GoogleScholarGoogle Scholar |
Megirian D
(1992) Interpretation of the Miocene Carl Creek Limestone, northwestern Queensland. The Beagle, Records of the Northern Territory Museum of Arts and Sciences 9, 219–248.
Muirhead J, Wroe S
(1998) A new genus and species, Badjcinus turnbulli (Thylacinidae: Marsupialia), from the Late Oligocene of Riversleigh, northern Australia, and an investigation of thylacinid phylogeny. Journal of Vertebrate Paleontology 18, 612–626.
Payne WW
(1978) A glossary of plant hair terminology. Brittonia 30, 239–255.
| Crossref | GoogleScholarGoogle Scholar |
Pike KM
(1953) Fossil fruiting cones of Casuarina and Banksia from Tertiary deposits in Victoria. Proceedings of the Royal Society of Victoria 65, 1–9.
Pole MS, Bowman MJS
(1996) Tertiary plant fossils from Australia’s ‘top end’. Australian Systematic Botany 9, 113–126.
| Crossref | GoogleScholarGoogle Scholar |
Reed KE
(1998) Using large mammal communities to examine ecological and taxonomic structure and predict vegetation in extant and extinct assemblages. Paleobiology 24, 384–408.
Scriven LJ, Hill RS
(1995) Macrofossil Casuarinaceae: their identification and the oldest macrofossil record, Gymnostoma antiquum sp. nov., from the Late Paleocene of New South Wales, Australia. Australian Systematic Botany 8, 1035–1053.
| Crossref | GoogleScholarGoogle Scholar |
Steane DA,
Wilson KL, Hill RS
(2003) Using matK sequence data to unravel the phylogeny of Casuarinaceae. Molecular Phylogenetics and Evolution 28, 47–59.
| Crossref | GoogleScholarGoogle Scholar | PubMed |
Torrey JG, Berg RH
(1988) Some morphological features for generic characterization among the Casuarinaceae. American Journal of Botany 75, 864–874.
| Crossref | GoogleScholarGoogle Scholar |
Truswell EM
(1993) Vegetation changes in the Australian Tertiary in response to climatic and phytogeographic forcing factors. Australian Systematic Botany 6, 533–557.
| Crossref | GoogleScholarGoogle Scholar |
White AW
(1997) Cainozoic turtles from Riversleigh, northwestern Queensland. Memoirs of the Queensland Museum 41, 413.
Williams SE, Marsh H
(1998) Changes in small mammal assemblage structure across a rain forest/open forest ecotone. Journal of Tropical Ecology 14, 187–198.
| Crossref | GoogleScholarGoogle Scholar |