Sentences with phrase «black shale»

Precipitation peaked when the orbit was at its most eccentric, producing deep lakes that left layers of black shale in eastern North America.

In Western Australia, they found preliminary evidence of these oxygen whiffs in black shales deposited on the seafloor of an ancient ocean.

Interspersed in the red stone were narrow bands of black shale containing petrified fish, from a time when a deep lake covered the area.

Today, black shale deposits are widespread around the perimeter areas of the former supercontinent, as evidenced by the rich source rocks yielding concentrations of Silurian oil in present - day Algeria and Saudi Arabia.

The fossils of the Burgess Shale are preserved as black carbon films on black shales.

The trilobites are fossilized inside black shale, which Hegna said likely happened as a result of them being forced out of their habitat by an event such as an undersea mudslide.

In keeping with the naming of its living relative (after an Eastern Cape river), the species name of the new fossil form, kowiensis, is after the Kowie River which rises among the hills where it was found, and the genus name, Serenichthys, honours Serena Gess, who provided land for the storage of more than 70 tons of black shale rescued from roadworks for ongoing research — in which all the new material was found.

The fossils come from black shales originally disturbed by road works at Waterloo Farm.

The osmium isotope evidence found in black shales correlates with higher continental weathering as a result of oxygen in the atmosphere.

In the new paper, researchers analyzed the same black shales for the relative abundance of an additional element: osmium.

Contributed by Marianne Stuart, Team Leader Groundwater Protection with the British Geological Survey Outcrop of main black shale formations in UK and selected oil and gas wells and gasfields.

Water Wells First believes vibrations from pile driving and now the operation of the wind farm have caused Kettle Point black shale sediments from the bedrock to clog several water wells.

He said health hazard protocols can provide information on what the safe level of black shale particles can be present in well water.

He was especially interested in learning why black shales, including the Marcellus, had a natural fracture pattern different from that of any other rock.

In a simple laboratory experiment, they took a sample of black shale from the landslide site and immersed it in an acid bath with a pH of 3, a level more acidic than the rain to accelerate the test.

According to the researchers, vanadium can be found in crude oil, asphalt and black shale, formed from acknowledged biological sources.

Permian - Triassic boundary in shallow marine sediments, characterised by a significant sedimentation gap between the black shales of Permian and dolomites of Triassic age.

The black shales contained high concentrations of the elements molybdenum and rhenium, long before the Great Oxidation Event.

He studied two well - preserved sequences of black shale, a type of rock that often contains organic matter and can produce oil under the right conditions.

To find out whether acid rain was indeed the problem, the team focused on one problematic sliding layer in the Jiweishan avalanche: a thin bed of black shale, which contains slippery clay minerals such as talc, in addition to fine organic material and calcite, which helps cement the shale together.

Instead, would form deposits of eventual coal or black shale.

He added this will help determine the proper certified filtration technology needed to effectively filter out the black shale.

This dearth of oxygen (anoxia) significantly decelerated the decomposition process, thereby providing the right conditions for the development of black shales.