Tchoumatchenco P., Philippe M., Yaneva M. (2008) Did Glaciation Occur during the Toarcian (Early Jurassic) in the East Stara Planina Mts. (East Bulgaria)? // Comptes rendus de l’Acade'mie bulgare des Sciences. Vol. 61. No.10. P.1301-1308.
The Lower Jurassic rocks in Eastern Stara Planina Mts. are of two types: shelf and basin. The shelf sediments are limestones, sedimentary allochtonous, redeposited in the basin as olistolites and/or conglomerates; the basin sediments are relatively deeper marine water (tectonically allochtonous), represented by siliciclastic flsch alternation - Sinivir Formation (Middle Norian - Lower Toarcian (p.p.) and by relatively thick bedded sandstones - Balaban Formation (Toarcian, p.p.); the last ones are of two types: proximal - in the southern exposures - sandstones intercalated by predominantly calcareous conglomerates (Debelets Member of the Balaban Formation), and distal - in the northern exposures - only sandstones (Balaban Formation - senso stricto). In the distal facies wood fragments have been discovered, determined as Xenoxylon phyllocladoides Gothan, marker for a cold and/or humid climate. The conglomerates in the Debelets Member are of two types - clasts supported and matrix supported. The matrix supported conglomerates are non-sorted and are interpreted as connected with the activity of local glaciers, which probably occupied the summits of the relatively high uplifted Zlatarski Exotix Range, formed at 370N - to cc. 200 km to south from the present day exposures. The Xenoxylon phyllocladoides Gothan probably inhabited their piedmonts. The clasts supported conglomerates are relatively well sorted, probably a result of mass debris ows.