Day 16. I often tease our palaeontologist that the only good fossil is a strain marker. So here are two nice strain markers trilobites (Asaphellus homfrayi and Angelina sedgwicki) with an elongation lineation . Tremadocian, locatity unknown, Keele collection.
Day 15 : I can’t believe this boulder that I carried two kilometres down the shore of of Loch Leven in Scotland back to the car didn’t make it into Rock365. So, for Rock366 here are interference folds in the Neoprotoerozoic Eilde Quartzite. Personal collection.
Day 14 : Buckle folding in slate showing similar folds and the effect of differing layer thickness on buckle wavelength. Locality unknown, Keele collection.
Day 13 : Disharmonic folding in a banded semi-pelite from Loch Leven, Scottish Highlands. Keele collection.
Day 12 : Back to the folds. Folded schistocity in a garnet hornblende schist (the garnet is post schistocity). The Ben Lui Schist Fm. from Creag Ard, Glen Lyon, Perth and Kinross, Scotland. [apologies for the purple pencil!]
Day 11 : In the field again, this time in Bewdley, Worcestershire. Here the local Lower Permian aeolian Bridgnorth Sandstone has been quarryied out and used for livestock holding pens.
Day 10 : Out on fieldwork. This is the Wenlock Limestone (Wenlockian, Upper Silurian) in Whitman’s Hill Quarry, in Storridge, near Malvern, Herefordshire. [Note: that permission is required to visit the quarry]
Day 9 : Highly attenuated isoclinal folds. Locality unknown.
Day 8 : Folds displaying change of amplitude and tightness. Locality unknown. Keele collection.
Day 7 : Alternating sand and mud layers in a phyllite from the Late Devonian Tredern Shale Fm. of Tintagel, Cornwall. The sandy layers develop more rounded fold profiles where as mud dominated parts show more angular folding. The cleavage development is quite variable. Keele Collection.