Debunking the Myths of Crimean Geology

Igor V. Popadyuk
Naukanaftogaz, Kyiv, Ukraine

The Crimea Mountains located in the southernmost part of Crimea Peninsula in southern Ukraine hold keys to the Black Sea understanding as the coastline of Crimean Peninsula spans both Western and Eastern Black Sea.
At least two myths of the regional stratigraphy might be debunked. Myth 1: Tauric Group is not Triassic-Early Jurassic in age. Based on published palaeontological data (Ammonites) it is likely the Tauric Group to be younger, the most probably Aptian- Early-Mid Albian in age. It means that the compressive event affected basins in the Crimea region at the end of Albian, not Middle Jurassic. Myth 2: The flysch and conglomerate successions widely developed on eastern Crimea and commonly referred to the Upper Jurassic are Tertiary in age as it might be concluded based on published palaeontological (foraminifera) data. It means the volume of clastics shed from the Crimea Mountains during the Tertiary uplift seems to have been significant.
Late Jurassic to Early Cretaceous successions are incorporated in two major thrust sheets, named structurally descending as Yayla thrust and Tauric thrust. Yayla thrust is composed mostly of shallow marine carbonates of Late Jurassic-Neocomian age. Tauric thrust consists of Tauric flysch succession and equivalent siliciclastic deposits of Aptian – Early-Mid Albian age. Both of these thrust sheets were transported northward probably during the Late Albian pulse and sealed by post-tectonic cover of Cenomanian to Late Eocene sediments. The Crimea region was tectonically uplifted and eroded after Late Eocene.

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece