Top Results for Precambrian

Kevin Burke (1929-2018) was a British-born geologist whose research addressed plate tectonics, African geology, Precambrian crust, hotspot tracks, and the structure of Earth's mantle. He helped relate surface geological features to long-term mantle processes, including the large low-shear-velocity p...

Martin Brasier was a British paleobiologist at the University of Oxford whose research examined the early fossil record and the origins of life. He studied Precambrian rocks and microscopic structures claimed as evidence of ancient organisms, including controversial fossils from the Apex chert of We...

W. Brian Harland (1917–2003) was a British geologist based at Cambridge University who spent decades conducting fieldwork in Svalbard, the Arctic archipelago. He compiled extensive geological surveys of the region and worked on Precambrian stratigraphy. Harland is also associated with early advocacy...

Spriggina floundersi is a small, segmented organism known from late Ediacaran fossils in South Australia and named after geologist Reginald Sprigg. Its body has a narrow, bilaterally organized outline and a differentiated anterior region sometimes described as a head shield. Proposed relationships t...

David Wacey is a British paleobiologist and geologist specializing in the study of early life on Earth, particularly during the Archean eon. His research heavily focuses on the rigorous analysis of Earth's earliest microfossils, including stromatolites and putative cellular remains found within anci...

Stanley Awramik is an American paleontologist and geologist who serves as a professor at the University of California, Santa Barbara. His primary research focuses on the study of Precambrian paleontology, specifically analyzing stromatolites and microbial mats as geological records of early life on...

J. William Schopf is an American paleobiologist and professor at the University of California, Los Angeles (UCLA). He is widely recognized for his foundational research on Precambrian microfossils, particularly his work on the Apex chert in Western Australia. Schopf's discoveries provided some of th...

The Laurentian Massif is an extensive upland region of southern Quebec formed from ancient Precambrian rocks of the Canadian Shield. Long erosion has produced rounded, forested hills and relatively modest elevations, generally below 1,000 meters, rather than sharp alpine peaks. The region contains n...

Lac Couture is an impact structure in Quebec, Canada, whose circular depression is occupied by the lake of the same name. The structure is roughly eight kilometres across, giving it a diameter of more than five miles, and glacial processes have influenced its present appearance. Its lake-filled inte...

Yarrabubba is a deeply eroded meteorite impact structure in Western Australia's Yilgarn Craton. Radiometric dating places the impact at 2,229 +/- 5 million years ago, in the Palaeoproterozoic era. The original crater is not preserved as a complete surface feature, so the structure is identified thro...

Janisjärvi is a meteorite impact structure in the Republic of Karelia in northwestern Russia. The structure is associated with Lake Janisjärvi and has an estimated diameter of about 14 kilometers. Its formation is generally placed in the late Proterozoic, making it a deeply eroded geological feature...

Keurusselkä is a large, deeply eroded impact structure in central Finland, associated with the Keurusselkä lake system. Evidence for the impact includes shock-metamorphosed rocks and other geological features identified around the lake. Its age is approximately one billion years, placing its formati...

Gardnos is a meteorite impact crater near Nesbyen in Buskerud, Norway. It is about five kilometers wide and formed approximately 546 million years ago, near the transition between the Precambrian and Cambrian periods. The site contains impact-related rocks and breccias, and it is used to explain how...

Piccaninny is a meteorite impact crater located within the Bungle Bungle Range in Western Australia, notable for its distinctive sandstone cone karst topography.

Gow is a deeply buried meteorite impact crater in Saskatchewan, Canada. Its estimated diameter is about 5 kilometers, but the structure is not exposed as a clearly visible surface crater because it lies beneath younger geological material. Available estimates place its formation near the Permian-Tri...

Lac La Moinerie is a meteorite impact crater in Quebec, Canada. Its most visible expression is a deep depression containing water, set within the Canadian Shield. The structure is notable because the impact feature is associated with a prominent lake in one of Earth’s oldest continental geological r...

Suvasvesi North is a meteorite impact structure associated with Lake Suvasvesi in central Finland. The impact formed a roughly circular depression that is now expressed as a bay or basin within the lake. Geological evidence places the event at approximately 85 million years ago, during the Cretaceou...

Nicholson is a meteorite impact crater in Canada's Northwest Territories. It has an estimated diameter of approximately 12.5 kilometers and formed about 400 million years ago, during the Devonian period. The structure is classified as an impact feature even though erosion and later geological proces...

Strangways is a meteorite impact structure in Australia's Northern Territory. The site is heavily eroded, so much of the original crater form has been removed or altered by later geological processes. Its most prominent remaining feature is a central uplift, created when the target rocks rebounded a...

Mark McMenamin is an American paleontologist and geologist known for work on Precambrian and early animal fossils. He is credited with coining the term Ediacara biota and proposed the Garden of Ediacara as an ecological interpretation of those communities. His ideas are discussed in paleobiology bec...

Saarijärvi is a small meteorite impact crater in the Republic of Karelia, Russia. Its diameter is about 1.5 kilometres, and its formation is estimated to date from the Neoproterozoic Era, a span of Precambrian geological time. The structure is studied as evidence of an ancient impact preserved in Ka...

Iso-Naakkima is an impact structure in Finland with an estimated diameter of about 3 kilometres. Its formation is placed more than 300 million years ago, during the late Paleozoic Era. The feature is an ancient geological record associated with a meteorite impact and is relevant to geologists and re...

Matt Wilson is a potential meteorite impact crater located in the Northern Territory of Australia, notable for its unique polygonal shape and central peak.

Goyder is a meteorite impact crater in Arnhem Land in Australia's Northern Territory. It is notable for shocked quartz, a form of quartz whose microscopic structure has been altered by the extreme pressure of an impact event. The feature provides geological evidence of a collision between an extrate...

Glikson is an eroded impact structure in the Little Sandy Desert of Western Australia. Geological studies describe a roughly 19 km diameter zone of deformed Neoproterozoic sedimentary rocks, with shatter cones and planar microstructures in quartz supporting an impact origin. Its ring-shaped aeromagn...

Lawn Hill is an eroded meteorite impact structure in northwestern Queensland, Australia, about 250 km north of Mount Isa. It appears at the surface as a ring of deformed Cambrian carbonate rocks around a central area of older Proterozoic sedimentary rocks, with an exposed diameter of roughly 18 to 2...

Kebira is a proposed meteorite impact structure in the Sahara near the border between Egypt and Libya. Remote-sensing images show a large circular landform reported to be about 31 kilometers across, and this shape has been interpreted as evidence of an impact event. The structure is less firmly esta...

Foelsche is an impact structure in the McArthur Basin of the Northern Territory, Australia. Its surface expression includes a roughly circular outcrop of Neoproterozoic Bukalara Sandstone and fractured, brecciated Limmen Sandstone interpreted as remnants of a crater rim about 5 to 6 kilometers wide....

The Santa Fe impact structure is an exposed, heavily eroded impact feature in the Sangre de Cristo Mountains about 5 kilometers northeast of Santa Fe, New Mexico. Shatter cones exposed in a road cut along New Mexico Highway 475 provide diagnostic evidence of shock from a meteorite impact. Its appare...

Kelly West is a deeply eroded impact structure in the central Northern Territory of Australia, southwest of Tennant Creek. The visible feature is a roughly 2-kilometre circular hill of Palaeoproterozoic quartzite interpreted as the central uplift of a larger crater; shatter cones provide key evidenc...