How did the loss of the Thulean Land Bridge affect mammal evolution in Europe and North America?

The Thulean Land Bridge, formed by the Greenland-Scotland Ridge, served as a vital terrestrial connection that allowed for the exchange of mammals between western Eurasia and eastern North America prior to the Eocene Epoch.1

During the middle of the Eocene, the subsidence of this ridge severed the connection, effectively isolating the two landmasses. This termination of the Thulean land connection was a pivotal event in geochronology, as it led to the development of distinct, separate patterns of evolution among terrestrial vertebrates in Europe and North America. While this specific bridge was lost, faunal exchange between Eurasia and North America continued later through the Bering Land Bridge, which facilitated repeated migrations throughout the Oligocene and Miocene epochs.12