Abstract
Synopsis Dilute hydrofluoric acid leaching of radiolarian cherts has yielded the first identifiable radiolaria from the Northern Belt of the Southern Uplands. The radiolaria are abundant, as are sponge spicules, and occur with spindle-shape hollow biomorphs of unknown affinity. The red-brown chert sequence at Hawkwood Burn may be correlated with the upper Llanvirn (Llandeilian)–Caradoc Haplentactinia juncta – Inanigutta unica assemblage in Nazarov’s (1988) biozonation. The presence of Protoceratoiciskum sp. and the absence of typical Arenig morphotypes indicates that the greenish-grey cherts near Crawford can also be tentatively regarded as of Llanvirn-Caradoc age ( sensu Fortey et al. 1995 ).
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