Sandstone Sills

: Sills often have planar or irregular margins with no evidence of erosion typical of riverbeds.

: The pressurized sand creates or exploits horizontal fractures in sealing layers like mudstone. sandstone sills

Sandstone sills are significant to geologists for several reasons: : Sills often have planar or irregular margins

Geologists use specific criteria to distinguish sills from standard depositional beds. sandstone sills

Sandstone sills are a type of clastic injectite. They form under specific geological conditions where fluid pressure exceeds the weight of the overlying rock.