Drumlins

 

Drumlins

A drowned drumlin in Clew Bay, Ireland (Wikipedia)

Cochise College

http://skywalker.cochise.edu/wellerr/students/glacial-erosion/project.htm

Drumlins form in clusters apparently near the terminus of glaciers. The mechanisms are debated.  They appear to have important interpretive value for direction and rate of glacial movement.