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The following craters are officially considered "unconfirmed" because they are not listed in the Earth Impact Database. Due to stringent requirements regarding evidence and peer-reviewed publication, newly discovered craters or those with difficulty collecting evidence generally are known for some time before becoming listed.
The Chesapeake Bay impact crater is a buried impact crater, located beneath the mouth of Chesapeake Bay, United States. It was formed by a bolide that struck the eastern shore of North America about 35.5 ± 0.3 million years ago, in the late Eocene epoch. It is one of the best-preserved "wet-target" impact craters in the world. [3]
Pisgah Crater, or Pisgah Volcano, is a young volcanic cinder cone rising above a lava plain in the Mojave Desert, between Barstow and Needles, California in San Bernardino County, California. The volcanic peak is around 2.5 miles (4.0 km) south of historic U.S. Route 66 - National Old Trails Highway and of Interstate 40 , and west of the town ...
The Ubehebe Craters are a volcanic field in the northern Death Valley of California, consisting of 14–16 craters in a 3-square-kilometre (1.2 sq mi) area. The largest of the craters is the 800 metres (2,600 ft) wide and 235 metres (771 ft) deep Ubehebe Crater. Many of the craters, though, are partially buried and thus hardly recognizable.
The crater is half a mile (one kilometer) wide and 500 to 777 feet (152 to 237 m) deep. The age of the crater is estimated from 2,000 to 7,000 years old. [1] In 2012, new evidence suggested that the crater may be as young as 800 years old, although this estimation was a lower bound, and it is still possible the crater is much older than that.
The EID lists fewer than ten such craters, and the largest in the last 100,000 years (100 ka) is the 4.5 km (2.8 mi) Rio Cuarto crater in Argentina. [2] However, there is some uncertainty regarding its origins [ 3 ] and age, with some sources giving it as < 10 ka [ 2 ] [ 4 ] while the EID gives a broader < 100 ka.
Interior of Amboy Crater showing a lava lake and the distant breach in the cinder cone rim. Interior of Amboy Crater from near breach showing lava lakes. Amboy Crater is a dormant cinder cone volcano that rises above a 70-square-kilometer (27 sq mi) lava field in the eastern Mojave Desert of southern California, within Mojave Trails National Monument.
Giant Rock is a large freestanding boulder in the Mojave Desert near Landers, California, and the Marine Corps Air Ground Combat Center Twentynine Palms covering 5,800 square feet (540 m 2) of ground. Giant Rock is the largest freestanding boulder in North America and is purported to be the largest free standing boulder in the world. [1]