Strednepleistocenni souvrstvi v byvale cihelne v Horkach nad Jizerou, okres Mlada Boleslav

Due to the recent mapping and study of soil micromorphology of the New brickyard at Horky nad Jizerou we revised the sequence documented in the 1950s and 60s in the Old brickyard at Horky nad Jizerou. The sediments at Horky nad Jizerou evolved in loess and fossil soil sedimentation, perhaps from the MIS 15 to pleniglacial of the last glaciation (MIS 2). Its development was interrupted by numerous hiatuses evident in the erosive interfaces.
The most significant soil complex with two soils (brown and black braunlehm, luvisoils) and soil sediment (soils 6-8, E-G) was developed in both brickyards. These soils are affected by two generations of ice wedges. According to the soil micromorphology, this soil complex can be correlated to the soil complex V (MIS 9) and both brickyards definitely contain this complex.The base of the loess sedimentary sequence in the New brickyard is composed of two soils (soils H and I), the uppermost corresponds to braunlehm type (soil H, minimally dated to soil complex VII - MIS 13).
Both soils of the soil complex IV (MIS 7) are present in the New brickyard, however, the lower one is remodified by significant solifluction and the upper one is at many places placed in paraautochtonnous position as well. From the soil complex III (MIS 5) only the upper part, the luvisoil, basal soil of Stillfried A, has survived, contrary to the brown soil of the Eemian interglacial which was eroded.
Since fifties several archaeological find have been explored in five sites in both brickyards. The oldest archaeological levels are at the site of Horky III, situated in the loess which has a minimum age of the MIS 14. Slightly younger is a limited collection of small dimension stone industry of Lower Palaeolithic character discovered at Horky II, which corresponds to either the MIS 13 or the MIS 11. The largest assemblage from Horky I was found within an erosion channel under the loess of the MIS 10 which was under a significant soil complex, corresponding to the MIS 9. The sediments filling this erosion channel seem to correspond to the beginning of the glacial the MIS 10. Two artefacts from Horky IV layed in the loess corresponding to MIS 8. The youngest site is Horky V situated in soil strongly affected by solifluction and corresponding to the MIS 7c.