1 Jagiellonian Uni ver sity, In sti tute of Geo log i cal Sci ences, Oleandry 2a, 30-063 Kraków, Po land 2 Pol ish Acad emy of Sci ences, In sti tute of Geo log i cal Sci ences, Twarda 51/55, 00-818 Warszawa, Po land Jach, R., Gradziński, M., Hercman, H., 2016. New data on pre-Eocene karst in the Tatra Moun tains, Cen tral Carpathians, Po land. Geo log i cal Quar terly, 60 (2): 291-300, doi: 10.7306/gq.1281Sparry lime stone, ferruginous muddy lime stone and lime stone brec cia have been found in the West ern Tatra Mts. They occur within Ju ras sic rocks of the Choč Nappe just be low red con glom er ates of prob a ble Eocene age. The de pos its found bear strong re sem blance to the infill of sub ter ra nean karst forms. They dif fer sig nif i cantly from Qua ter nary karst de pos its of the Tatra Mts. The d 18 O val ues of spelean car bon ates sug gest crystallisation at rel a tively high tem per a tures (over 20°C) whereas their rel a tively neg a tive d 13 C val ues im ply the pres ence of soil-de rived CO 2 linked with veg e ta tion dom i nated by C3 path way plants. The karst forms and their infill were formed be fore the Eocene trans gres sion, which shows un equiv o cally that the Tatra Mts. were sub jected to karstification at that time.