Dear Keiva: The drumlin I played on was made of till, to be sure. But it was far higher and more massive than the majority made by till falling into a crevasse. There appeared to be a rock formation that parted the oncoming glacier. allowing the till to be deposited in the empty "V" behind it. In a few places in New England there are remnants of volcanic activity and other magma extrusions that might have made the drumlin I described.