Jurassic outcrop depositional sequence stratigraphy in western Bulgaria

Pages: 
pp. 49-54
Geological Institute BAS, Acad. G. Bonchev Str., Bl. 24 1113 Sofia, Bulgaria
Abstract: 

Sloss (1963) and the group of EXXON used names of North American Indian tribes as Absaroka, Zuni for the nominqtion of the 1st order sequence stratigraphic units. For their subdivisions they used Lower and Upper Absaroka, etc. and their subdivisions, in turn, were designated by number – 1, 1.3, etc. (Haq et aI., 1988). Latter, however, Hardenbol et aI. (1998) used another system. They gave to the sequence the index of the stage, where passed the lower sequence boundary – Toa 1, Toa 2, etc. for the Toarcian sequences, etc.
   For designation the sequences (Fig. 1) in the field, I used the name of the section and the number of the sequences above one reper – Lyalintsi - 1, Komshtitsa 2.1, etc., which nomination is expressed in the Fig. 2-4.
   The Bulgarian Lower and Middle Jurassic fauna, especially ammonites (Sapunov, 1976a, b, 1977 a, b), brachiopods, etc. possesses links with the Northwestern European (Boreal/Subboreal) bioprovince and the Upper Jurassic - with the Southwestern European (Tethyan/Submediterranean) bioprovince. That is why I correlate the two parts of the Bulgarian Jurassic sequence stratigraphic scheme with the relative western European sequence stratigraphic standards of Hardenbol et aI., (1998).
   The western Bulgarian Jurassic sediments are divided into two 1st order sequences, called by Tchoumatchenco, Lakova (1994) – Lower and Upper Major Jurassic depositional sequences. Here I follow the manner of nomination of the sequences, used by Hardenbol et aI. (1998) – after their stratigraphical position. For the Lower Major Sequence I use the name Hettangian-Lower Callovian, and for the Upper Major Sequence-Middle Callovian-Berriasian Depositional Sequence. The Hettangian-Lower Callovian Sequence is subdivided, in its turn, into two 2nd order sequences – Hettangian-Lower Toarcian sequence (coinciding more or less with the North American super cycles (Haq et aI., 1988) Upper Absaroka 2-4 (UAB 2-4) and Upper Toarcian-Lower Callovian sequence (coinciding partially with the super cycles Lower Zuni A 1-3 (LZA 1-3). Here will be described only the 1st order sequences.

VOLUME 32 (2-4)/December 2002 110th Anniversary of Acad. Prof. Strashimir Dimitrov; XVII Congress of the Carpathian-Balkan Geological Association

Geologica Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev St., bl. 24, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Akad. G. Bonchev Str., block 24
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Akad. G. Bonchev Str., block 24
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Akad. G. Bonchev Str., block 24
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Akad. G. Bonchev Str., block 24
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Akad. G. Bonchev Str., block 24
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Akad. G. Bonchev Str., block 24
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Akad. G. Bonchev Str., block 24

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev str. Bl. 24

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Geological Institute, Bulgarian Academy of Sciences,Sofia 1113, Bulgaria, Acad. G. Bonchev str, bl. 24
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Geological Institute, Bulgarian Academy of Sciences,Sofia 1113, Bulgaria, Acad. G. Bonchev str, bl. 24
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Earth Science Section of the Uviversity of Geneva, 13, rue des Maraîchers, 1211 Geneva 4, Switzerland
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Earth Science Section of the Uviversity of Geneva, 13, rue des Maraîchers, 1211 Geneva 4, Switzerland

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Geological Institute BAS, Acad. G. Bonchev Str., Bl. 24 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Sofia University "Sv. Kliment Ohridski", 1504 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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Sofia University "Sv. Kliment Ohridski", Tsar Osvobodilel Blvd, 15, 1000 Sofia
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Geological institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
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Geological institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
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Geological institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
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University of Mining and Geology "Sv. Ivan Rilski", 1700, Sofia

Geological institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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Institute of Geochemistry, Siberian branch of the Russian Academy of Sciences, P.O.B. 4019, 664033 Irkutsk
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Geological Institute, Bulgarian Academy of Sciences, Sofia, 1113
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Geological Institute, Bulgarian Academy of Sciences, Sofia, 1113
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Geological Institute, Bulgarian Academy of Sciences, Sofia, 1113
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Geological Institute, Bulgarian Academy of Sciences, Sofia, 1113
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Geological Institute, Bulgarian Academy of Sciences, Sofia, 1113
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Geological Institute, Bulgarian Academy of Sciences, Sofia, 1113

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Geological Institute, Bulgarian Academy of Sciences, Sofia, 1113

Geological Institute, Bulgarian Academy of Sciences

Geological Institute, BAS, Acad. G. Bonchev Street Bl. 24, 1113 Sofia, Bulgaria

Geological Institute of BAS, 24 Acad. G. Bonchev Sir., BG - 1113 Sofia
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Geological Institute of BAS, 24 Acad. G. Bonchev Sir., BG - 1113 Sofia
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Geological Institute of BAS, 24 Acad. G. Bonchev Sir., BG - 1113 Sofia

Geological Institute at the Bulgarian Academy of Sciences, Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
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Geological Institute at the Bulgarian Academy of Sciences, Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
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Geological Institute at the Bulgarian Academy of Sciences, Acad. G. Bonchev Str., 1113 Sofia, Bulgaria

University of Mining and Geology, Studentski grad, Sofia, 1100, Bulgaria
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Geological Institute of Romania, Caransebes Str. No 1, Bucharest, RO-78344, Romania
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University of Belgrade, Dusina 7, Belgrad, 11000, Yugoslavia
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Geological Institute of Romania, Caransebes Str. No 1, Bucharest, RO-78344, Romania

Geological Institute at Bulgarian Academy of Sciences, Sofia 1113

Sofia University "Sv. Kl. Ohridski", Department of Geology and Palaeontology, 1504 Sofia