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Shocked quartz. Shocked quartz is a form of quartz that has a microscopic structure that is different from normal quartz. Under intense pressure (but limited temperature), the crystalline structure of quartz is deformed along planes inside the crystal. These planes, which show up as lines under a microscope, are called planar deformation ...
Evidence for the impact origin of the crater includes shocked quartz, [15] a gravity anomaly, and tektites in surrounding areas. In 2016, a scientific drilling project drilled deep into the peak ring of the impact crater, hundreds of meters below the current sea floor, to obtain rock core samples from the impact itself. The discoveries were ...
This is also known colloquially as shocked quartz. [8] Material properties (size, color, texture) of fulgurites vary widely, depending on the size of the lightning bolt and the composition and moisture content of the surface struck by lightning. Most natural fulgurites fall on a spectrum from white to black.
Tektite. Two splash-form tektites, molten terrestrial ejecta from a meteorite impact. Tektites (from Ancient Greek τηκτός (tēktós) 'molten') are gravel -sized bodies composed of black, green, brown or grey natural glass formed from terrestrial debris ejected during meteorite impacts. The term was coined by Austrian geologist Franz ...
Free-air gravity anomaly over the Chicxulub structure (coastline and state boundaries shown as black lines) The Chicxulub crater (IPA: [t͡ʃikʃuˈluɓ] ⓘ cheek-shoo-LOOB) is an impact crater buried underneath the Yucatán Peninsula in Mexico. Its center is offshore, but the crater is named after the onshore community of Chicxulub Pueblo ...
What really has pushed Moore’s theory forward is the discovery of the shock-fractured quartz at all three sites, the first time they’ve been located at the Younger Dryas depth in so many ...
Sudbury Basin. The Sudbury Basin (/ ˈsʌdbəri /), also known as Sudbury Structure or the Sudbury Nickel Irruptive, is a major geological structure in Ontario, Canada. It is the third-largest known impact structure on Earth, as well as one of the oldest. [1] The structure, the eroded remnant of an impact crater, was formed by the impact of an ...
Manson impact structure. The Manson impact structure is an impact structure near the site of Manson, Iowa where an asteroid or comet nucleus struck the Earth during the Cretaceous Period, approximately 74 Ma. [1] It was one of the largest known impact events to have happened in North America. [2] Previously it was thought to have led to the ...