Dinosaur-age fossilised remains of tiny organisms usually found inwards the ocean convey been discovered inwards inland, arid Commonwealth of Australia - suggesting the expanse was, for a brusque fourth dimension at least, inundated yesteryear ocean H2O xl 1000000 years before Australia's large inland ocean existed.
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| One of the dinoflagellate cysts, usually the campaign of carmine tides inwards the sea, has been found inwards arid Commonwealth of Australia [Credit: Carmine Wainman, University of Adelaide] |
Researchers at the University of Adelaide, inwards collaboration alongside geological consultancy MGPalaeo, discovered these microfossils inwards Jurassic rocks of south-western Queensland, nigh the town of Roma.
Described inwards the journal Palynology, the fossils convey been dated to the belatedly Jurassic period, 148 1000000 years ago. This is a fourth dimension when Commonwealth of Australia was joined to Antarctica, together with where dinosaurs roamed across ancient rivers, floodplains together with swamps.
"We convey enough of bear witness from the 110 million-year-old vast inland Eromanga Sea, which covered a large swathe of central, eastern Commonwealth of Australia during the Cretaceous current (following on from the Jurassic)," says Dr Carmine Wainman, Postdoctoral Fellow inwards the University of Adelaide's Australian School of Petroleum.
"We've seen the opalised fossils sold inwards Adelaide's Rundle Mall, together with the spectacular ancient marine reptiles on display inwards the South Australian Museum - all from the afterward Cretaceous period.
"However, this novel microfossil bear witness from the same percentage suggests at that topographic point was a short-lived precursor to this ocean xl 1000000 years earlier."
Dr Wainman believes these microfossils must convey been brought inland yesteryear an incursion of ocean H2O together with thence evolved speedily to arrange to the freshwater or brackish atmospheric condition every bit the ocean waters piece of cake receded.
"There is no other viable explanation for how they managed to accomplish the interior of the Australian continent when the ancient coastline was thousands of kilometres away," Dr Wainman says.
"It was likely a result of ascension ocean levels during a fourth dimension of greenhouse atmospheric condition before the institution of the Eromanga Sea. With farther investigations, nosotros may abide by to a greater extent than of these microorganisms or fifty-fifty fossilised marine reptiles that uncover untold secrets virtually how this utilization of the the world looked inwards the Jurassic."
Source: University of Adelaide [June 05, 2018]
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