Can you tell what it is yet?

Dragged little brother along to our freshly unearthed 18thC packhorse bridge again today. Made some rubbings of the brickwork underneath on a variety of papers with a variety of materials. Good fun. Dunno how they'll fit into the project yet... keeping an open mind. He's a great sport - couldn't manage without him :-)
Weather set to turn later today - torrential rain forecast - so good job we went in the drizzle before the beck turns into a deluge :-)