## 5 Conclusions  
We tested the combination of a classical sediment-core analysis (grain size and TOC) with CT and XRF detailed core investigation and soil electrical conductivity measurements in an area with a former marsh field in western Peloponnese. The core, site-specific analysis led to the identification of three sedimentological units with discrete textural and geochemical characteristics: (1) the upper, mostly silty-clay, unconsolidated and organic-rich unit (0-1 m) with characteristic low HU values; (2) the middle unit (\(\sim\)1-2 m) comprising mainly sand, with minor clay/silt content, with higher HU values, increased density, and considerable organic content; and (3) the lower unit (\(\gtrsim\)-2 m). The latter  
Figure 8: Three-dimensional model of core AG with additional regions of interest (ROI) highlighted in boxes. Additional HU boundaries were attached in all regions in order to better visualize organic residues, shell fragments, etc.  
Figure 7: Representative conductivity results for the transect EmTST02 of the studied field with the three sedimentological units.  
presents a monotonous distribution of all studied parameters and differs from the middle unit in that it does not present any considerable amount of organic material.  
The analysis was extended from site-specific to field-wide by applying an electromagnetic geophysical prospection along with nine parallel profiles, each of -400 m length. The inversion of surface measurements of the soil's apparent electrical conductivity provided a clear picture of the distribution of electrical conductivity throughout the investigated area, down to a depth of more than 4 m. Electrical conductivity showed a gradual increase with depth and analogue fluctuations with the sedimentological analysis at the site of the core sample, with the rate of increase changing at ~1 m and ~2 m. These changes are mild, and the increase with depth is smooth and continuous, which favours an interpretation linked to the increasing density of the soil material with depth. Similar distributions were derived for all nine examined profiles, supporting the extension of the site-specific core analysis to the entire investigated field.  
The following are available online at [[https://www.mdpi.com/article/10.3390/app11209575/s1](https://www.mdpi.com/article/10.3390/app11209575/s1)]([https://www.mdpi.com/article/10.3390/app11209575/s1](https://www.mdpi.com/article/10.3390/app11209575/s1)), Table S1: Grain size values (sand, silt, and clay) and the TOC content measurements are also presented.  
Conceptualization, P.A. and P.B.; methodology, P.A., P.P. and A.E.; software, A.E., P.P. and Z.R.; validation, A.E., P.A. and Z.R.; data curation P.P., A.E. and Z.R.; writing--original draft preparation, P.A., A.E. and Z.R.; writing--review and editing, P.A.; supervision, P.A. and P.B. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
The data presented in this study are available on request from the corresponding author.  
The authors thank [PERSON], MSc Geologist, for the support in data acquisition in the field.  
The authors declare no conflict of interest.