Mars

Mercury

Venus

Earth’s Moon (S. Pole)

Mistastan Lake, New Foundland, Canada 28 Km 38,000 years

Barringer Meteor Crater, AZ 1.18 km 49,000 years

Wolf Creek, Australia 0.875 Km 300,000 years

Bosumtwi, Nigeria 10.5 Km 1.3 Million years

Roter, South Africa 2.5 km 5 Million years

Karakul, Tadjikistan 45 Km < 10 Ma

Chicxulub, Mex

170 Km 65 Ma

Clearwater Lakes, Sask.

32 km/22km 290 Million years

Deep Bay, Sask.

13 km 100 Million years

Gosses Bluss, Australia 22 km 142.5 Million years

Aorounga, Chad 17 km 200 Million years

Manicougan Lake, Quebec 100 km 212 Million years

Radar Image of NEO 1999JM8Missed Earth by 5 million km in 1990, 6 million km in 1999

Average diameter 3.5 km

80 million trees knocked down over 2,150 square kilometres (830 square miles

Tunguska Event, 1908, Russia

Tunguska Event 1908

Equivalent to a 100 MT Nuclear Bomb Blast

Question

If cratering rate on Earth is same as our Moon, why are their so few craters

preserved?

What is wrong here?

Apollo 14 site spherules

(~ 0.2 mm diameter)

Argon40/Argon39 dates

(accuracy ~ +/- 200 MY)

Apollo 14 site spherules

(~ 200 micro-meters diameter)

Argon40/Argon39 dates

(accuracy ~ +/- 200 MY)

=> 26 Ma periodicity

1 BY averaging bins

Black and opaque spherules only

Question: If cratering rate on Earth is same as our Moon, why are their so few craters preserved?

Answer: Erosion