The Baltic Klint beneath the central Baltic Sea and its comparison with the North Estonian Klint

Paleozoic rocks structure versus Cenozoic cuesta relief along the Baltic Shield–East European Platform transect

“…To ob tain the best re li abil ity be tween the on shore and off shore data and to maxi mise structure con tour ing data points off shore, the Cam brian-Or do vi cian bound ary was cho sen as the most in for ma tive struc tural surface. This sur face, co in cid ing largely with the con tact of terrigenous and cal car e ous rocks (Tuuling and Flodén, 2009a;Niel sen and Schovsbo, 2011), is eas ily rec og niz able as a strong seis mic re flec tor (O 1 ) just be low the rim of the sub ma rine Bal tic Klint (Tuuling and Flodén, 2016), and can be firmly fixed even in the bore holes when no core was taken. Fur ther more, this level en ables the struc tural tran si tion and changes from the cen tral Bal tic Sea area to be fol lowed di rectly to wards the Swed ish east coast; its emer gence above the sea can be precisely lo cated on the geo log i cal map of Öland (Figs.…”

“…Fol low ing the his tory of for ma tion and the pres ent struc tural set ting of the plat form cover, the Landsort-F¯rö sec tor has re peat edly acted as a zone of crustal weak ness. Thus, the tec tonic ac ti va tion of this sec tor af fected the de vel op ment of the Bal tic Or do vi cian-Si lurian Ba sin, and played an im por tant role in shap ing the Ce nozoic ter raced morphostructure along the Bal tic Shield-East Euro pean Plat form transect (Tuuling and Flodén, 2016).…”

“…Dur ing Early Pa leozoic times, this zone also con trolled the dis tri bu tion/con fig u ration of the sed i men tary bas ins that de vel oped in this re gion (Flodén, 1980;Bas set et al, 1989;Hagenfeldt, 1994;Puura and Flodén, 1997;Tuuling and Flodén, 2000b). Di vid ing the tec toni cally op po site and oblique move ment ar eas, this intracratonic deep crustal Bal tic-Bothnian mo bile zone (Puura and Flodén, 1997) also ter mi nates the west ern ex ten sion of the south erly slop ing BH (Tuuling and Flodén, 2016).…”

“…Sec ondly, this struc tural hinge-line also slightly mod i fies the course of the Bal tic Klint. The lat ter, across the BH ex tend ing es carp ment, which has an ap prox i mate W-E course in north ern Es to nia, at tains a slight south west erly trend in north west ern Es to nia (Tuuling and Flodén, 2016).…”

“…In ac cor dance with the regional tec tonic de vel op ment and struc tural set ting, a great amount of Early Pa leo zoic rocks have been re moved from the Bal tic Shield area. Pres ently, a cuesta-type ter raced re lief, eroded into the Cam brian-Si lu rian lay ers, ex tends along the Bal tic Shield-East Eu ro pean Plat form con tact from Es to nia across the cen tral Bal tic Sea, and con tin ues along the east coast of Swe den (Tuuling and Flodén, 2016).…”