big freeze

The big freeze of 1963 was the coldest winter on record with snow from December to February.

But the critical period leading up to Snowball Earth was thought to be missing because the rock layers were eroded by the big freeze.

The big freeze, which covered nearly all the globe in two phases for 80 million years, is known as "Snowball Earth", after which the first animal life emerged.

The big freeze, which covered nearly all the globe in two phases for 80 million years, is known as "Snowball Earth", after which the first animal life emerged.

But the critical period leading up to Snowball Earth was thought to be missing because the rock layers were eroded by the big freeze.