Discover Scotland and Explore the Geodiversity of the Agassiz Rock in Edinburgh. Sip back and discover Scotland and explore the geodiversity of the Agassiz Rock a Site of Special Scientific Interest (SSSI) in Edinburgh. Located beside the disused Blackford Hill quarry within the Hermitage of Braid and Blackford Hill Local Nature Reserve in south Edinburgh. This volcanic rock surfaces within the reserve feature distinctive smooth grooves called striations formed by the abrasio