By Kevin Jones and Stephen Blake
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An eruption age of Continental break up and opening of the Iapetus Ocean 43 MacDuff Slate c. 490–470 Ma? ) Tayvallich Volcanics tuffs c. 601 Ma dykes c. 595 Ma Argyll Group Ben Vuirich Granite c. 590 Ma syngenetic base metal deposits Port Askaig Tillite c. 750–720 Ma (Sturtian) Appin Group deposition post-c. 9 c. 800 Ma Grampian shear zones and pegmatites c. 840 Ma metamorphism deposition post-c. 1000 Ma? A simplified chronostratigraphy of the Dalradian Supergroup (not to scale). c. 595 Ma has been obtained by dating zircons from a mafic dyke intrusive into the lavas, and a felsic tuff has yielded an age of c.
There is also no continuous section. Piecing all the evidence together, it has been estimated that the Dalradian succession is at least 25 km thick. As with other major sedimentary successions, the Dalradian Supergroup is divided on the basis of a hierarchy of scales, which are, from largest to smallest, Group, Subgroup and Formation. 3). In most parts of the Dalradian Supergroup a consistent stratigraphy has been established on the basis of distinctive lithologies and lithological associations cropping out in a consistent order, as determined from sedimentary and igneous way-up structures.
750– 590 Ma. Critical information on the biostratigraphic age of the highest preserved parts of the Southern Highland Group is provided by the presence of Early Cambrian trilobites, c. 517–509 Ma, within the Leny Limestone (found north of Callander). In north-east Scotland, in the Buchan area, the youngest sedimentary rocks of the Macduff Slate have yielded microfossils interpreted as Early Ordovician in age, although these identifications remain highly controversial and are not wholly accepted.