This geological age/stage occurred at the end of the Eopleistocene or according to some data, the Lower Pleistocene.

Lithology and Depositional Environments of Chaudian Sediments in ...
by AA Svitoch - 2001
(a) Location of sections and (b) structures of Chaudian sediments in the Pekla Section. Structure types: (1) thin horizontally ...
www.springerlink.com/index/R5X4H6W8Q3773585.pdf
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Morphology and post-Chaudian (Late Pleistocene) evolution of the ...
the post-Chaudian regression to the present day. Terra Nova, 6502-511,1994. ..... Durq the Chaudian (Cromerian, about 0.4-0.75 Ma; Tab. 21, a period of ...
doi.wiley.com/10.1111/j.1365-3121.1994.tb00894.x
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IngentaConnect Lithology and Depositional Environments of Chaudian ...
by AA Svitoch - 2001
The Chaudian sediments composing the Pekla and Tuzla sections are characterized by a variable lithology and transgressive structure. ...
www.ingentaconnect.com/content/maik/limi/2001/00000036/.../...
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The Black Sea Environment - Google Books Result
Andrey G. Kostianoy, Aleksey N. Kosarev - 2007 - Science - 457 pages
Judging from the mollusk assemblages, at the beginning of the transgression, the salinity of the Late Chaudian sea was probably either equal to the ...
books.google.com/books?isbn=3540742913...

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Note added at 1 day2 hrs (2010-02-03 14:01:54 GMT)
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Another reference which includes the Old Euxine (Black Sea area). The W. Europe equivalent of the Chaudian is the Mindel-Sicilian and in the Caspian Sea area the Bakinian (stage).

Dynamics of the coastal North Black Sea area in Late Pleistocene ...
by PM Dolukhanov - 2009
Chaudian (Lower Pleistocene) formed in an environment of a vast alluvial and marine coastal plain;. 2. Old Euxine and Uzunlarian (Middle Pleistocene) ...
linkinghub.elsevier.com/retrieve/pii/S1040618208000864