Different gear manufacturers had different styles of marking the crank and cam gears. Whatever method they used, they will line up when a straight edge is placed through the center of the crank snout and the center of the camshaft. Any way you can achieve this alignment is proper. The mark in the crotch of one gear might align with the mark on the peak of the other. Sometimes there are two marks on one gear that straddle the mark on the other gear.

It sounds like you have the concept...it's pretty simple. You must have really dropped the crank for those timing gears to have come apart.

Stuart