As glaciers retreat, they leave behind deposits of

Glaciers leave behind deposits known as glacial till, which are unstratified, poorly-sorted sediments. Glaciers move a wide range of sedimentary particles from small clay-sized particles to large boulders. When the glacier either melts or retreats, these poorly-sorted sediments are deposited.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus