The Origin of Some Circular Features in the Southern Limb of Seno Mountain Northwest of Mosul / Iraq.

The present study describes and tries to identify the possible origin of some circular features that observed during field work at the southern limb of Seno Mountain Northwest of Mosul / Iraq. From structural Geology point of view this mountain considered a symmetrical anticline and one of many anticlines that satellite the giant Sinjar Mountain. The circular features identified at the lower member of Al-Fatha Formation (Middle Miocene), this member generally consist of complete and incomplete cycles of Gypsum and Limestone while the Upper member consists besides that of Claystone and Marl. The lower member consists the core of the mountain while the upper member rimmed of it also the upper member represent low relief compare with core.
Many circular features identified at the Southern Limb of Seno.
Anticline but the largest one has a diameter of about fifteen meters. These circular features can be divided into two distinct parts, the inner which represents most of the features and consists of friable Gypsum and Salt and outer part which represents the frame of these features and consists of hard well bedded Limestone which is dipped radially from the center. The amount of dips of these Limestone is about ten degree and vertically jointed. The amount and direction of the Limestone are not coincide with the general dips of the beds of the southern Limb generally to the south and reach about twenty five degree.
The present study also discussed the reasons that causes not delineated the circular features by remote sensing methods during the preparation of photogeological map of the study area and show also that depend only on these methods can guide to incorrect interpretation.