I may not be using the right term. It's when the glacier goes over and drags little rocks along the bedrock and makes groves. You can see it on the corner near the Spanish Civil War Memorial too, there's that bit of exposed bedrock there.

I just use this site for tides when I don't have a tidebook to hand: http://tides.mobilegeographics.com/locations/6488.html (you'll have to change it to Vic).