File:DalradianExcursion011.jpg

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Summary

description
English: Stratigraphic column at Port nan Clach Cruinn. Key

1 Vesicular lava with basal pipe amygdales. Load structures cause sediment to be squeezed upwards into lava. Toes of lava project downwards and northwards into the sediment causing minor fold disturbances. 2 Interbedded cream limestone (1-3 cm) and cream calcareous phyllite (0.5-1 cm). 3 Channel filled by limestone containing boulders of grey limestone in a matrix charged with angular fragments of quartz. Whole unit is cross-bedded, indicating derivation from south. 4 Pure grey limestone with beds 1-10 cm thick. 5 Parallel laminated (0.5-1 cm) limestone. 6 Graded limestone with fragments of quartz (1-1.5 cm) and black calcareous slate. Channelled base trending 110°. Intruded from below by a sedimentary dyke of 7. 7 Laminated (0.2-2 cm) limestone with sand-sized quartz fragments. 8 Conglomerate with boulders of dark grey limestone. 9 As 7. 10 Conglomerate of rusty weathering black limestone with largest fragments measuring 100 X 50 cm. 11 As 7. 12 Grey limestone with fragments (0.5-1 cm) of malachite and quartz. 13 As 7 with ripple marked base.

14 Massive limestone with quartz (0.5-1.5 cm) and black slaty limestone (1-3 cm) fragments. Flute casts at base indicate current from south-east. From: P. J. Gower 1977. 3: The Dalradian rocks of the west coast of the Tayvallich peninsula. Scottish Journal of Geology v 13. p125-133.
source Dalradian rocks of the South-west Highlands. Scottish Journal of Geology 13 (2) 1977
author Edinburgh Geological Society

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