Flute casts

This specimen shows flute casts on both sides. It is an unusually thin turbidite, being only about three mm. thick. The specimen is sandy- silty rather than muddy, which suggests that it is a proximal turbidite. It was collected from a small quarry just on the outskirts of Dolfor village, near Newtown, Powys. Between Dolfor and Llandrindod Wells. This quarry has yeilded some interesting specimens, including several cm. of bentonite, some quite large loaf shaped concretions, and concretions with about 50% interior calcite.

Chatwell sandstone. Onny valley.

This specimen of Chatwell sandstone was collected on the Onny valley trail, which is on the outskirts of the town of Craven arms, in Shropshire. This is from the higher level of the sandstone, is green in colour,  and packed with numerous shells. The sandstone is in the Caradoc series of the Ordovician period.

Alternata limestone. Onny valley.

This Ordovician fossiliferous limestone is so named because it is packed with numerous brachiopods  Heterorthis alternata, as in the lower inset picture.  It was collected by the side of the river in the Onny valley, near Craven arms in Shropshire.

Pentamerus sandstone. Shropshire.

This specimen of fossil rich sandstone was collected from Hillend in Shropshire. It is from the Pentamerus beds, which are in the upper Llandovery series of the Silurian period. The location is on the S.E margin of the long Mynd. This rock has earned the "nickname" of Government rock, alluding to the characteristic arrows of the pentamerus oblongus which are reflected in prison uniforms of many years ago.

Mineral rich sedimentary rock-2.

This specimen was collected from the same location as Mineral rich sedimentary rock-1  It differs only in the amoumt of quartz and silica. in specimen 1 the major component was quartz, with just a little calcite. In this specimen the major component is calcite with only a small amount of quartz. The calcite has the appearance of a flow deposit, and as in the other specimen,when viewed fron the side there are traces of the original layers of sediment.