Gemorphogenetics of the Classical Karst - Kras

V casu med eocenom in pliocenom so bile s temena krednega apnencevega antiklinorija v osrednjem in zahodnem delu planote Kras in s kozinsko-podgrajske antiklinale erodirane flisne plasti, zaradi cesar se je ob splosnem zniževanju okoliske ravnine ob pogojih zajezenega krasa razsirjal in zniževal ravnik na razkritih apnencih. Najvecji del planote Krasa predstavlja najstarejsi del kraskega ravnika. Na Krasu so se v pliocenu in kvartarju pasovi ravnika hitreje zniževali v smeri proti SZ, vmesno zastajajoce ali dvigujoce se povrsje pa je s tem dobilo obliko vzpetin na severozahodnem robu planote. Zaradi hitrejsega grezanja vipavske sinklinale so vodni tokovi prenehali teci preko planote Krasa se preden je bil flis, ki jim je prepreceval pot proti jugu, odstranjen zaradi grezanja severnega dela Tržaskega zaliva. Zaradi tega na Krasu ni slepih dolin ali polj. Pac pa je veliko vrtac, povrsje je kamnito, zaradi cesar je iz Krasa nastal splosni pojem kras. Obe znacilnosti sta tipicni za submediteranske dinarske kraske ravnike, gosto naseljene in obdelane ter zaradi tega brez gozdov Between Eocene and Pliocene, erosion of flysch strata on the top of Cretaceous limestone anticlinorium in the central and western part of the Kras plateau and the Kozina-Podgrad anticline uncovered and widened – and simultanously lowered - the karst plain in the conditions of dammed karst. The largest portion of Kras plateau is covered with karst plain, its oldest part. In Pliocene, the karst plain was fractured and subsided towards the NW regardless of older folded structure; during this process, several zones of elevations were formed through slower subsiding or uplifting. Due to faster lowering of the Vipava syncline, water streams stopped running over the Kras plateau before the flysch, damming the waters from the Kras plateau to the south was removed due to the subsiding in the northern Gulf of Trieste. Thus, no fossil blind valleys or poljes are found on the Kras plateau. However, there is considerable density of dolines and the surface is stony, giving the karst its original name. Both phenomena are typical of deforrested, densely populated and cultivated Submediterranean Dinaric karst plains.