32 Questions
What did U of M researchers recently discover in Minnesota?
An ancient meteor impact crater
Where was the discovered crater located?
In a suburb on the Mississippi River
How does the size of the Minnesota crater compare to the Meteor Crater in Arizona?
The Minnesota crater is larger
What unit of U of M was involved in the discovery of the crater?
College of Science and Engineering
How deep is the Minnesota crater located beneath the surface?
350 feet
What is the main method used to estimate the diameter of the meteor that hit the Minnesota site?
Assumptions based on other studied Earth craters
What is the estimated range of projectile sizes based on crater diameter estimates and surface rock densities?
150-600 meters
What is the characteristic evidence for the crater's origin mentioned in the text?
Defects in shocked quartz
When is it estimated that the strike happened?
490 million years ago
What geological period was drawing to a close at the time of the strike?
Cambrian period
What type of rock formed as the Cambrian period was drawing to a close and showed signs of disturbance?
Jordan Sandstone
How many sites are already in the official Earth Impact Database, according to the text?
190
What is the density of the surface rock mentioned in the text?
$1.65 tons$ per cubic meter
What period does late Cambrian life consist of, according to the text?
Paleozoic era
What is characteristic of meteor craters, according to the text?
$1.65 tons$ per cubic meter density
"Overlying younger rock and glacial deposits" showed what sign in relation to disturbance, according to the text?
"No sign of such a disturbance"
What is the characteristic evidence for the crater's origin mentioned in the text?
Shocked quartz
What geological period was drawing to a close at the time of the strike?
Cambrian period
What period does late Cambrian life consist of, according to the text?
Simple oceanic organisms
What type of rock formed as the Cambrian period was drawing to a close and showed signs of disturbance?
Jordan Sandstone
What is the estimated range of projectile sizes based on crater diameter estimates and surface rock densities?
Between 150 and 600 meters
How does the size of the Minnesota crater compare to the Meteor Crater in Arizona?
Smaller
Where was the discovered crater located?
Minnesota
How deep is the Minnesota crater located beneath the surface?
Not mentioned
How many sites are already in the official Earth Impact Database, according to the text?
190
When is it estimated that the strike happened?
About 490 million years ago
What is the estimated average depth of the Minnesota crater beneath Inver Grove Heights?
350 feet
What unit of the U of M was involved in the discovery of the crater?
Minnesota Geological Survey (MGS)
How does the size of the Minnesota crater compare to the Meteor Crater in Arizona?
It should have an area 11 times the size of Meteor Crater
What is characteristic of the Minnesota meteor crater, based on the text?
It is exceptional and was a massive impact
How many meteor impact sites have been confirmed worldwide?
190
What did the U of M researchers recently discover could soon be added to the list of confirmed meteor impact sites?
An ancient crater in Minnesota
Learn about the recent discovery of an ancient crater in Minnesota by researchers from the University of Minnesota. Join the team of scientists at the Minnesota Geological Survey (MGS) and explore the significance of this exceptional finding in the field of geology.
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