Abstract

A widely accepted hypothesis states that episodes of active sea-floor spreading, growth of oceanic rise systems, and eustatic rise of sea level are interrelated and occur simultaneously. Opinions vary as to the correspondence of episodes of active sea-floor spreading and associated epicontinental transgressions with orogeny. Review indicates that if. orogeny is not restrictively defined to particular short-lived events, it takes place during episodes of active sea-floor spreading when oceanic rise systems are large so that orogeny and eustatic rise of sea level correlate in time.

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