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Composite aeromagnetic anomaly map of the Yarrabubba impact structure within the Yilgarn Craton, Western Australia, showing the locations of key outcrops and samples used in this study. The image combines the total magnetic intensity (TMI, cool to warm colors) with the second vertical derivative of the total magnetic intensity (2VD, grayscale) data. The demagnetized anomaly centered on the outcrops of the Barlangi granophyre is considered to be the eroded remnant of the central uplift domain, which forms the basis of the crater diameter of 70 km. Prominent, narrow linear anomalies that cross-cut the demagnetized zone with broadly east-west orientations are mafic dykes that post-date the impact structure. Image credit: Erickson et al, doi: 10.1038/s41467-019-13985-7.

Earth’s Oldest Known Meteorite Impact Structure Identified

Jan 22, 2020 by News Staff

The 70 km- (43.5-mile) diameter Yarrabubba impact structure in Western Australia is approximately 2.23 billion years old, according to new research led...

Geologic map of the Mountain Pass study area, California. Image credit: Denton et al, doi: 10.1130/GES02066.1.

Geologists Find Rare Earth Element-Bearing Rocks in Mojave Desert

Jan 7, 2020 by News Staff

A team of researchers from the U.S. Geological Survey has mapped a rare earth element-bearning deposit in the Mountain Pass region of the eastern Mojave...

This map shows locations of samples analyzed to estimate crustal thickness during the Laramide orogeny. Text in white boxes is the average crustal thickness and average age for locations (labeled in brown) with over 5 samples. CRM - Catalina-Rincon Mountains, BM - Baboquivari Mountains. Image credit: Chapman et al, doi: 10.1130/G47117.1.

Southwestern U.S. Was Once Similar to Today’s Tibetan Plateau: Study

Dec 5, 2019 by News Staff

New research suggests that during the Late Cretaceous epoch to the Early Paleogene epoch (80-50 million years ago), much of the southwestern United States...

Massive Asteroid Impacts Triggered Early Plate Tectonics, Study Suggests

Nov 27, 2019 by News Staff

When and how the Earth evolved from a molten mass into a rocky planetary body continually resurfaced by plate tectonics remain some of the biggest questions...

An illustrated meteorite impact scenario to exemplify the Siljan impact event. Image credit: Henrik Drake.

Signs of Ancient Microbes Found within 381-Million-Year-Old Crater

Nov 6, 2019 by News Staff

Fractured rocks of impact craters may be suitable hosts for deep microbial communities on Earth and potentially other terrestrial planets, yet direct evidence...

Rasmussen & Muhling show that the infiltration of liquid hydrocarbons was responsible for the formation of these filamentous microfossils from the Red Dog Zn-Pb-Ag massive sulfide deposit in the western Brooks Range, northern Alaska, the United States. Image credit: Rasmussen & Muhling, doi: 10.1130/G46346.1.

New Type of Fossilization Discovered

Nov 5, 2019 by News Staff

A previously unrecognized mode of fossilization of ancient microbes may explain how some of Earth’s oldest microfossils formed, according to new research. Rasmussen...

The Akkadians (left) and the Gutians (right). Illustration by H.L. Bacon.

Cold Winters and Strong Winds Contributed to Akkadian Empire Collapse, Study Suggests

Oct 25, 2019 by News Staff

The Akkadian Empire, the first united empire in Mesopotamia, was established around 2300 BCE and abruptly collapsed two centuries later. According to a...

Kimberlite from a mine in the United States. Image credit: Woudloper / CC BY-SA 1.0.

Researchers Find Chemical Signatures of Earth’s Primordial Mantle in Kimberlites

Oct 23, 2019 by News Staff

A team of geoscientists from Australia, Canada and the UK has detected primordial chemical signatures preserved within young kimberlites, small-volume...

The Geode of Pulpí, Spain. Image credit: Canals et al, doi: 10.1130/G46734.1.

Scientists Reconstruct Geological History of Spain’s Giant Geode

Oct 16, 2019 by News Staff

In a paper published in the journal Geology, Dr. Juan Manuel García-Ruiz from the Universidad de Granada and colleagues reveal the geological history...

Baumgartner et al provide exceptional evidence for the biogenicity of some of Earth’s oldest stromatolites through preservation of organic matter, including microbial remains, by sulfidization. Image credit: Paul Harrison.

Organic Matter Found in 3.5-Billion-Year-Old Stromatolites

Oct 3, 2019 by News Staff

Researchers have found exceptionally preserved organic matter inside samples of rock from the 3.5-billion-year-old Dresser Formation in the Pilbara region...

The Sahara Desert is the world’s largest hot, non-polar desert.

Sahara Desert is At Least 4.6 Million Years Old, New Research Shows

Sep 25, 2019 by News Staff

The Sahara Desert is the largest warm desert in the world, but its age has been controversial, with estimates ranging from the Miocene epoch (23-5.3 million...

Broken and rounded dodecahedral diamond from the Koffiefontein kimberlite pipe that hosted goldschmidtite; the mineral is seen in green and radiation damage of the diamond can be seen in the brown regions. Image credit: Meyer et al, doi: 10.2138/am-2019-6937.

Goldschmidtite: New Mineral from Earth’s Mantle Found inside Diamond

Sep 24, 2019 by Natali Anderson

A team of geologists from the University of Alberta, Northwestern University and the University of Glasgow has found a previously unknown mineral in a...

Scanning electron microscopy image (colorized) showing edscottite in the polished Wedderburn section from the UCLA Meteorite Collection. Image credit: Ma & Rubin, doi: 10.2138/am-2019-7102.

Edscottite: Mineral ‘Never Seen in Nature’ Discovered inside Meteorite

Sep 7, 2019 by Sergio Prostak

A meteorite found in Australia — called the Wedderburn iron meteorite because of where it was found — contains edscottite, an iron-carbide...

Hong et al found meteoric groundwater in two subsea canyons near the Lofoten archipelago, Norway. Image credit: NORCRUST / CAGE.

Marine Geologists Find Freshwater in Norwegian Sea

Sep 2, 2019 by News Staff

An international team of marine geologists has found evidence for meteoric water flow at 2,625 feet (800 m) below sea level near the Lofoten archipelago...

Chindesaurus bryansmalli. Image credit: Petrified Forest National Park.

Elevated Levels of Oxygen Gave Rise to North American Dinosaurs, Scientists Say

Aug 22, 2019 by News Staff

A team of researchers from Rensselaer Polytechnic Institute and the University of Texas Austin has used a new technique to analyze tiny amounts of gas...

The Kohnen Station in Antarctica. Image credit: Sepp Kipfstuhl.

Scientists Find Interstellar Iron in Antarctic Snow

Aug 20, 2019 by Natali Anderson

A team of researchers from Germany, Austria and Australia has found traces of the radioactive isotope iron-60 — the tell-tale signature of a supernova...

Ancient volcanoes. Image credit: Sharon Ang.

Jurassic Volcanic Province Discovered in Australia

Aug 13, 2019 by News Staff

An international team of researchers has discovered around 100 ancient volcanoes and associated lava flows buried deep within the Cooper-Eromanga Basins...

The Maryborough meteorite. Image credit: Rodney Start / Museums Victoria.

Maryborough Meteorite: Massive Stony Meteorite Found in Australia

Jul 31, 2019 by News Staff

A 17-kg chondrite meteorite that landed on Earth less than 1,000 years ago has been discovered by chance in the Australian state of Victoria. The Maryborough...

Scientists Find 1.2-Billion-Year-Old Impact Crater Off Coast of Scotland

Jun 10, 2019 by News Staff

A 3,300-foot- (1 km) wide asteroid struck our planet 1.2 billion years ago, according to new research published in the Journal of the Geological Society. An...