Mix cookie crumbs with margarine in bowl. Reserve 1 cup.
Press remaining mixture over bottom of waxed paper-lined
pan. Bake 5 minutes. Chill. Spread vanilla ice cream over
crust. Sprinkle with reserved crumbs. Sprinkle with reserved
crumbs. Freeze until firm. Top with softened chocolate
ice cream. Freeze until firm. Place on serving plate. Loosen
side with knife. Remove side. Freeze until serving time.
Frost with whipped topping.