Conversation so far:
when was Dinosaur Jr. formed
J Mascis and Lou Barlow played together, on drums and guitar respectively, in the hardcore punk band Deep Wound, formed in 1982 while attending high school in western Massachusetts.
does the hardcore punk band Deep Wound, formed in 1982 have an album
Deep Wound was an American hardcore punk band. They released one self-titled 7 which is sought after by fans and record collectors alike.
Any mention of notable members in hardcore punk band Deep Wound during Dinosaur Jr.'s formation
Gerard Cosloy had dropped out of the University of Massachusetts Amherst to focus on running his independent record label, Homestead Records
any interesting thing about Dinosaur Jr.'s formation besides Gerard Cosloy dropping out of the University of Massachusetts Amherst to focus on running his independent record label, Homestead Records
Dinosaur Jr. was initially named Mogo, and played their first show on University of Massachusetts Amherst campus in the first week of September 1984.

Question: who formed it
Self-contained rewrite: who formed the band Mogo after Gerard Cosloy had dropped out of the University of Massachusetts Amherst during Dinosaur Jr.'s formation