There Was Once A Land Bridge
The land bridge vanished about 12,500 years in the past during the end of the last glaciations, which caused the rise of sea levels. While a lot of people call this period the last ice age, this is technically incorrect. Basically, we are still in one! However, it is a warm one known as the Quaternary. The period has gone on for almost 2.6 million years. This is considered an ice age because the poles remain frozen.
Glaciation Periods Of The Ice Age
In this ice age, there have been glaciation periods. They are characterized by very cold weather in which the polar ice reached the equator. The last one ended about 12,5000 years in the past after lasting over 100,000 years. At its apex, a two-mile-deep ice field was lying over present-day New York City.