HOME >> BIOLOGY >> NEWS
Reefs and atolls of the Australian outback

When the Australian explorer Charles Sturt went looking for an inland sea, he wasn't wrong; just a few million years too late. Oceans once covered great areas of what is now inland Australia. Their traces remain in fossils, minerals and geological formations that reveal much about how Earth has changed over time.

Dr Nicholas Lemon from Adelaide University's National Centre for Petroleum Geology and Geophysics has been field-mapping a Precambrian reef complex in what is now the Flinders Ranges National Park. The work began in 1984 as part of his PhD project. Interest was renewed when Dr Lemon showed the area to a group of international geologists. "They were aware of similar occurrences in North America, but which were not of the same age, and they could see the importance of this outcrop," said Dr Lemon.

Not far from the Brachina Gorge Geological Trail, the reefs at Enorama formed as a fringe around a diapiric island. In geological terms, a diapir is a mobile core containing minerals of low density such as salt. The core pushes upwards, deforming overlying rock to form a dome on the Earth's surface. The ancient diapir at Enorama formed an island in shallow seas, buoyed up by salt. There are similar examples today in the Persian Gulf.

The shallows around the island promoted the growth of bacteria. These precipitated minerals around them, the solid residue growing into a form of stromatolite. Living stromatolites survive at Shark Bay in Western Australia, while fossil forms are common in rocks of the Flinders Ranges.

In microscopic sections, the Enorama stromatolites do not show the usual fine layers, but a succession of thick layers with a clotted texture. They resemble calcareous bacteria well known from later times. These bacteria were colonial, growing as "shrubs" anchored to the sea floor or hanging like branches from rocky outcrops.

The Enorama reefs are built of stromatolitic mounds up to six metres high and ten metres ac
'"/>

Contact: Dr. Nicholas Lemon
nlemon@ncpgg.adelaide.edu.au
618-8303-4293
Adelaide University
30-Jul-2000


Page: 1 2 3

Related biology news :

1. Increasing Carbon Dioxide Threatens Tropical Coral Reefs
2. Rare, tiny find in West Australian waters
3. Australian overturns 15 years of nano-science doctrine
4. World-first Australian truffle find
5. Australian researchers locate heart attack genes
6. Australian frog is first to make its own chemical weapons
7. New grain variety opens up possibilities for Australian farmers
8. Changes in Australian ecosystems tied to arrival of exotic animals
9. AVAX Technologies receives an additional $3.0 Million (AUD) investment in Australian joint venture from Australian Vaccine Technologies Ltd.
10. Scientists Use Fossilized Emu Eggshells To Discern Changes In Vegetation, Provide Additional Evidence Of Human Impact On Australian Landscape
11. Australian Scientists In World-First Cell Discovery

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:7/22/2020)... ... July 21, 2020 , ... USDM Life Sciences ... compliance, announces a new solution to manage regulated workloads on Microsoft Azure. , ... technology stack complies with FDA and global regulations. USDM's new managed service for ...
(Date:7/4/2020)... ... July 03, 2020 , ... Aesthetics ... recognition and multiple awards for not only the products and treatments developed, but ... and Vivace® Microneedle RF. All the brands built by ABM have received several ...
(Date:6/28/2020)... ... June 25, 2020 , ... ... biopharmaceutical R&D, today announced that it has entered into a multi-year contract ... (Multiclonics®), to support their translational and clinical research strategy to discover and ...
Breaking Biology News(10 mins):
(Date:8/12/2020)... ... August 11, 2020 , ... The FSHD ... Facioscapulohumeral Muscular Dystrophy Clinical Trial Research Network (FSHD CTRN), with consideration ... is a consortium of academic research centers in the United States and Europe ...
(Date:8/3/2020)... ... August 03, 2020 , ... ERT, ... President and CEO has been named one of the 100 most inspiring individuals ... PharmaVoice 100 honorees are selected based on how they have inspired their colleagues ...
(Date:7/31/2020)... ... 2020 , ... Diversified Technologies, Inc. has introduced a full ... drive Klystrons, TWTs, IOTs, and magnetrons. , DTI Radar Transmitter Systems ... push-pull configuration; yielding fast fall time for a capacitive load. These all solid-state ...
(Date:7/31/2020)... ... 29, 2020 , ... The SDX® Respiratory Gating System ... has reached its 20th anniversary of worldwide use. Introduced in the US over ... including University of Pennsylvania, University of Michigan, University of Maryland, University of California ...
Breaking Biology Technology:
Cached News: