Tortonian


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Tortonian

[tȯr′tō·nē·ən]
(geology)
A European stage of geologic time: Miocene (above Helvetian, below Sarmatian).
References in periodicals archive ?
Upwards in the sequence, Tortonian sandstone and clay levels represent the foredeep deposits of the Apennine chain, with a thickness of 800 m [35].
It outcrops north of Lisbon as a steep east-verging reverse fault placing Jurassic rocks of the LB, at the west, over Miocene deposits of Tortonian age, at the east.
The palaeontological study of fossil assemblages from the Upper Miocene (Tortonian) marine deposits of the eastern sector of the Guadalquivir Basin allows interpreting palaeoenvironmental and depositional conditions when this basin acted as a connection between the Atlantic Ocean and the Mediterranean Sea.
Tortonian flora from the "Gdow Bay" in the South of Poland.
The Middle Miocene of Helvetian and Tortonian stages can be traced in the Gobustan and Pre-Caspian Guba and in the inter-fluve of the Kura and Iori, where the Tortonian is spread to the Absheron region.
(1990): Coral reefs in coarse-terrigeous sedimentary environments (Upper Tortonian, Granada Basin, Southern Spain).
(2009) reported U-Pb ages in zircons of 8.4-9.0 [- or -] 0.2 Ma from riodacite porphyry bodies in the central part of the Santander Massif, which evidences a magmatic phase during the Late Miocene (Tortonian) that took place during the Andean Orogeny.
In contrast, coralline red algae communities become dominant, as most phototrophic carbonate producers thrive in shallow marine environments [49], especially through Early Miocene to Tortonian [14].
Many of the rocks surrounding La Yeguada and in the greater area are Miocene volcanics, mostly at or near Tortonian (11.6 to 7.2 Ma).
The amount of uplift of this area during the early Tortonian reached 200-350 m, and during the subsequent episods of tectonic mobility in Messinian and Zanclean time it varied from 75 to 300 m.
Similar evidences were revealed by drillings: the presence of small karst caves at the contact between the Messinian evaporitic formation (Gessoso Solfifera Formation) and the older Tortonian marls (SanfAgata Fossile Formation).