sedimentology, granulometry, valley development, ERT

The abrupt change in valley floor development occurs throughout the Last Glacial - Interglacial cycle. The presented study is a part of wider research of the Holocene development of the Satina river incision in the Lysá hora mountain group. Detailed sedimentological analysis of a bank outcrop on the Satina river upper reach left bank reveals the presence of colluvial layers formed by debris flows with fluvial intercalations. The river channel is vertically cut into sediments of a relative depth of c. 19m and further into another 4m of the bedrock formed by thinly laminated claystones. We used grain-size, fabric, clast orientation and particle shape analyses in order to determine the genesis of the particular layers. 14 separate fluvial and colluvial layers of sediments have been distinguished in the vertical profile of the total depth of 22m.