Stratigraphic Age and Morphometric Features of Upper Pleistocene Flow Till Pebbles from the Papuča Gravel Pit (Gospić, Croatia)
DOI:
https://doi.org/10.17794/rgn.2025.4.13Keywords:
flow till, pebble stratigraphy, size and shape, Upper Pleistocene, Mt. Velebit, CroatiaAbstract
This research was conducted in the Papuča gravel pit southeast of Gospić (Croatia). The fan-shaped sediment body, up to 14 m thick, is composed of poorly sorted, coarse-grained, and unconsolidated sandy gravel. Over 200 blocks and pebbles were selected from the gravel pit. The main criteria for sample selection were based on their potential for determination of their stratigraphic age. The clasts are Jurassic, Triassic, and Permian provenance. Selected clasts were measured for morphometric analyses. According to the median (Md = 7.5 mm), the gravel is medium-grained, with 50% gravel size clasts. The Trask coefficient (So = 6.44) indicates poor sorting, while the skewness coefficient (Sk = 0.313) indicates an asymmetric clast size distribution, with a prevalence of clasts larger than the median value. The Zingg diagram points to a predominance of spheroidal clasts followed by discoidal and rod-shaped clasts while blade-shaped clasts are scarce. The flatness ratio of clasts is 1.7, which is consistent with traditional calculations for fluvio-glacial and moraine deposits. The clast lithological analysis (macro and micro) was performed. The results indicate the dominance of limestone clasts. Glacially formed troughs, including ravines Ljutik and Široka Draga on the northern, steep slope of Mt. Velebit, served as pathways for meltwater, which transported clasts of various sizes and stratigraphic ages, originating from the glacier base and from the hillsides. The age of the gravel is estimated at 20,700 ± 200 years, during the glacier retreat at the beginning of Greenland Interstadial No. 1 of the Late Pleistocene.
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Copyright (c) 2025 Josipa Velić, Ivo Velić
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