The mixture of sediments deposited directly by a glacier is called

The answer is till. Till is unsorted glacial sediment, showing no formation of strata.

Glacial till

Explanation:

The glacier is a mass of ice. When it detaches from the ice cap, it starts moving from one region to another. This is one reason for soil erosion, call glacial erosion. The moving glacier gathers many sand particles, stones below it. When it reaches the warmer region, it starts melting. As a result of glacier melting, the sand, and stones attached to it remove from it and starts deposited as land forms. This deposited clay and sand particle call glacial till.  

do you have a picture?

the answer to you question is   jet streams