https://opendata.uni-kiel.de/receive/fdr_mods_00000081 https://opendata.uni-kiel.de/servlets/MCRFileNodeServlet/fdr_derivate_00000084/Horsens_2017-2018.zip https://opendata.uni-kiel.de/rsc/thumbnail/fdr_mods_00000081.png 2024-09-18 data set Geophysical data: Horsens GPR (Kettle Hole Investigation) 2017 to 2018 database We investigated a small kettle hole near the township of Tyrsted, south of Horsens (Denmark) with the aim to determine the extension and depth of this feature using geophysical methods. A former excavation at Tyrsted carried out from the Horsens Museum in 2017 at a neighboring site revealed Late Palaeolithic flint of the Bromme type and worked reindeer antlers. This connection in a Late Glacial horizon is unique not only in a Danish context and it can help to improve and clarify the dating of the Bromme culture. We used ground penetrating radar (GPR), electromagnetic induction (EMI) and electrical resistivity tomography (ERT) to estimate the extension of the kettle hole (~16 m × 25 m). Shear wave reflection and refraction seismics (SH Seismics) were able to detect the bottom sediment of the former lake at about ~5 m depth. Furthermore, a seismic event at about 1.30 m depth is visible which can be associated to the transition between the Allerød and Younger Dryas sediment making the detection of the Bromme horizon possible. After the non-invasive investigation, a location for an open excavation has been chosen in a way to groundtruth the geophysical results allowing the direct comparison with the stratigraphy. These results allow the archaeologists to identify key excavation areas focused on the investigation of the Allerød and Younger Dryas layers in a way to improve the dating information about the Bromme horizon collected so far. en 550 his Host institution aut Author Corradini, Erica 0000-0003-4266-8589 Corradini Erica Wilken, Dennis aut Author 0000-0002-5128-351X Wilken Dennis 10.57892/100-81 Panning, Diana aut Author 0000-0002-3167-0360 Panning Diana Pickartz, Natalie aut Author 0000-0002-3290-7032 Pickartz Natalie Rabbel, Wolfgang aut Author 0000-0003-4720-6906 Rabbel Wolfgang Eriksen, Berit Valentin ctb Contributor 1073231380 39552572 0000-0002-6651-9249 Eriksen Berit Valentin Mortensen, Morten Fischer ctb Contributor 0000-0002-4167-8227 Mortensen Morten Fischer Nielsen, Martin Krog ctb Contributor Nielsen Martin Krog Thorwart, Martin ctb Contributor 0000-0002-0060-4141 Thorwart Martin Krüger, Sascha ctb Contributor Krüger Sascha 2017 2018 2022 290391021 Archäologische Prospektion kettle hole Ground Penetrating Radar Tyrsted, Horsens 55.823319, 9.842750 A GSSI GPR unit with a 200 MHz center frequency antenna was used to perform the measurements at site 8 (the antenna was pulled on the ground using markers along measuring tapes) The GPR campaign took place in June 2017 with the aim to have a first look at the area and to identify the location and the dimension of the wetland area. The measurements were carried out by pulling the GPR antenna on the ground following the natural topography of the subsurface. The field conditions in some locations of site 8 were difficult for the application of GPR because part of the surface was covered with water. Due to the mentioned unfavorable field conditions we decided to undertake the NS profile only in the west side of area 8. Therefore, a rectangular grid of GPR profiles with 2 m spacing in both directions was performed, covering an area of 575 m2 of the total 750 m2. In summer 2018 we performed two intersecting ERT profiles (ERT1 and ERT2). A RESECS (Geoserve) system was used to carry out the measurements. Wenner-Alpha, and Dipole-Dipole array configurations were used. ERT1 (47.5 m long) consists of 96 electrodes with 0.5 m spacing whereas ERT2 is 31.5 m long and made of 64 electrodes with 0.5 m spacing. Electrode locations were determined by Differential GPS (Trimble R10). We used the CMD Mini-Explorer by GF Instruments and conducted EMI measurements in vertical (VCP) and horizontal coplanar (HCP) configuration. The device is operating at 30 kHz with three receiver coils in 0.32 m, 0.71 m and 1.18 m distance to the transmitter. The manufacturer gives approximate values of sounding depth. Corresponding to the three coil separations these are 0.25 m, 0.5 m and 0.9 m in VCP configuration and double in HCP configuration. The area was covered with parallel profiles in east-west direction and 1 m separation. The sample frequency was 10 Hz. For studying the kettle hole we conducted a 61 m long S-wave profile almost in the middle of site 8. The data were recorded with 3 Geometrix Geode seismographs placed in line, equipped with 72 10-Hz horizontal geophones oriented perpendicular to the profile line. The seismograms were digitized with 0.125 ms sampling interval and 0.5 s recording time. Two blows were applied from one side at each shot point and the corresponding records were summed (“stacked”) to improve the signal/noise ratio. The steel bar was coupled to the ground by steel spikes mounted at the bottom of the bar. The use of a horizontal force perpendicular to the profile line generates dominantly SH-waves. Indeed, P-waves were not observed in the data. The source points were located midway between the receivers and the steel bar and blows oriented perpendicular to the profile line. The acquired data covers a frequency band from 10 Hz to 90 Hz. Data formats: *.pdf; *.txt; *.png; *.dat; *.shp; *.sgy; *.tif; *.csv; *.cfg; *.xls: *.MAP fdr_mods_00000081 https://opendata.uni-kiel.de/receive/fdr_mods_00000081