Putting on my historical cap I was able to tell him that the vicinity around the slipway was once where the old town drain spilled its contents into the harbour and that is most likely the origin of the animal bones and teeth in Margate Harbour.
This afternoon I have been reading up on articles on Horn Corner and Hazardous Row when I can across an article by Mick Twyman. It was one of the last he published before he died and it was a write up he did on Harzardous Row. In a paragraph about the Parade and the bridge that went over the town drain he mentions a wooden hut beside the bridge that can be seen in the copied print on the right of the bridge as you look at it. This wooden hut was in fact a butchers shop and it belonged to a George Penn who was reckoned to have thrown animal remains into the town drain from his shop.
I suppose the evidence is conclusive as in a vicinity where old animal bones and remains are found it just happens to be the outlet of where the old town drain spilled its contents into the harbour and there just happens to be an old butchers shop by that outlet (circa 1790's). Somehow I do not think we will need time team to work that one out.
Anyway I reckon with full confidence that more butchered animal remains will be found when the north wall fronting the Parade is dug and in the Harbour in general.