THE LOOP METHOD IN EXPLORING BURIED STRUCTURES 247 



tskaia) and Yarkovskaia (Bash-Kirgizkaia) (^^) on the other have also been 

 discovered by the loop method. 



At the Kharchenkov (Arma-Elin) area instead of two parallel structures, 

 the loop method showed the presence of one structure of considerable 

 dimensions with a small bulge on the northern limb. 



The long Vladislavovskaia fold is divided owing to the axial variation 

 of its plunge into two anticlines — Vladislavovskaia and Frontovskaia 

 (Koi-Asanskaia), which is of interest from the point of view of its possible 

 petroleum content (^'*). This work in the south-west plain showed the contin- 

 uation of a number of tectonic zones (Yarkovskaia, Severnaia Belobrodskaia, 

 Dyurmenskaia, Dal'nii, etc.) 



Work carried out by the loop method on the Uzunlar area was very revealing. 

 The Uzunlar dome is placed in the south-east part of the south-west plain. 

 Before work with the loop method (1949) the Uzunlar dome was an undefined 

 large bulge of Maikop clay. 



The loop method has been used to study the tectonics of the Maikop core 

 within the limits of which a large Mar'inskaia anticline, which lies to the 

 south-west of the Uzunlar lake, was depicted and parallel to it a small upfold 

 related to the distant (Atan-Alchhiskaia anticline zone (^^) was found. 



The Dal'naia zone contains the structure of the same name and the geologi- 

 cally known Karangat anticline (^^ which is situated on the Karangat cape. 

 The existence of the Mar'inskaia anticline was shown first by A. D. Arkhan- 

 gel'skaia in the section on the western shore of the Uzunlar lake. The northern 

 side of the Karangat structure and the previously accepted schemes of the 

 tectonic structure of the Kerch peninsula referred to the most southerly 

 anticlinal zone, the remaining parts of which were assumed to be covered 

 by the Black Sea. 



Geophysical work has shown the course of the Karangat and Dal'naia 

 structures and has produced a more firmly based scheme of tectonics of the 

 southern part of the south-western plain of the Kerch peninsula. The schematic 

 structure of the Uzunlar dome is also supported by the results of a detailed 

 geological survey carried out on this area in 1950 ^^^K 



In 1949-1950, using the loop method, studies were made of an area 

 adjoining the south-west plain from the north and north-east (Zaparpachskaia 

 part). The structure of this part of the peninsula is represented by core 

 of Maikop clays, which lie in depressions and are surrounded by the deposits 

 of Mediterranean age. They differ in the high complexity of the tectonic 

 structure (Fig. 3). However, under these conditions, the loop method clearly 

 shows the tectonic features of the Maikop cores of the structures (position 

 of the axis, the presence of axial variations of plunge and possible faults), 



