siltstone

They were made almost exclusively out of siltstone with a few exceptions.

In the central part of the watershed, the bedrock is siltstone.

This one" she touched the smooth blue rock layer"is siltstone.

During this era, sandstone and siltstone formed in the area.

It is preserved in red siltstone with only its underside exposed.

Red shale and siltstone occur in the lower part of the formation.

By the top of the column, siltstones and claystones become dominant.

This is particularly true for fine sandstones and siltstones.

Siltstone - more than half of the composition is silt-sized particles.

Siltstone is differentiated by having a majority silt, not clay.

The fossil is preserved on the surface of a fine-grained siltstone.

The middle portion and most of the upper portion are on siltstone.

It is a combination of limestone and five to twenty percent siltstone depending on the location.

If the rock feels "gritty" against one's teeth, then it is a siltstone.

Rock from this group is mostly quartz sandstone, with a small amount of siltstone.

The formation also includes lesser amounts of siltstone and mudstone.

The surrounding hills are made of sandstone, siltstone and shale.

The trunk of this armoured fish is preserved in a fine-grained siltstone.

In order for a rock to be named a siltstone, it must contain over fifty percent silt-sized material.

The upper reaches of the watershed lie over siltstone.

Siltstones and mudstones appear beneath the main upper bed of sandstone.

These can include shale siltstone fragments, and (at times) chert.

The formation is composed of slates and siltstones together with some sandstone.

To the north, it grades into the siltstone Borden Formation.