Consideration of stratigraphic sections from five areas of northeastern Maine suggests that marked lateral lithofacies changes occur within the Ordovician and Silurian systems over very short distances.
F i g u r e 1 . A u y à n -T e p u i F r o m t h e S o u t hF i g u r e 2 . M o u n t R o r a i m a (S o u t h S i d e )Upper part composed of sedim ents; lower slopes of quartz gabbro.
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