Any tame Portuguese archeologists about??

Whilst digging my vegetable patch, deep deep, down I have been coming across various shards of pottery.  As a potter I recognise it isn't an even manufactured clay, it is a mix with bits of tiny stones in it and an uneven firing temperature which suggests a basic kiln type and very clearly isn't glazed or to do with drainage.  

I have often thought that cultivation of our land here dates back centuries, with wonderful terracing and water well which possibly might be pretty ancient.  Now I need to find an expert who might date a few shards of pot.  There is also a stone I found which isn't like our local stone, and I think could possibly be an ancient axe head - my husband thinks it's a ...stone.

Here are my prized finds.  Any positive helpful comments please send to