This dataset contains an assembly of geological water-level indicators, relevant for studying relative sea level rise (RSLR), regional subsidence quantification and causal breakdown, coastal prism accommodation and Holocene aggradation chronology of the Holocene Netherlands. It gives a sources-referenced, uniform overview of 658 basal geological water-level indicators collected from original research of various type and application (140 primary references). From the indicators, 59% was collected in 1950-2000, mainly in academic studies and survey mapping campaigns; 37% was collected in 2000-2020 in academic studies and archaeological surveying projects, 4% was newly collected (this study), the latter mainly in previously under sampled central and northern Netherlands regions. 117 are true sea-level indicators (so-called SLIPs), the majority of datapoints (536) are inland water level indicators that are upper limiting to sea-level. The total number of entries is 712, because we included some literature mentioned rejected samples and deep positioned intercalated water level indicators. The dataset is compiled in the so-called HOLSEA workbook format. It covers measured, calculated and classification fields defining the geological observational data and its uncertainties, allowing to document and assess indicative meaning adapted to specific use variants. Hereto, the workbook contains expansions to the original format. See Related Works (ESSD paper: De Wit et al. 2024).

Main changes v2.0: The correction for the past tidal amplitude is now applied to both SLIPs and ULD in columns 71-73. In version 1 it was applied to SLIPs only. However, since ULD are also relatable to a past sea level it is relevant to add the tidal correction for these indicator types as well. Three additional columns were added, columns 71**-73**, to store the corrected relative sea level (RSL) and uncertainties, excluding the background tectonic correction. The dataset now documents the corrected RSL with (col. 71) and without (col. 71**) the background tectonic signal. The region “Rhine-Meuse central” was renamed “Rhine-Meuse delta inland”, matching De Wit et al. (2024). Corrected some small errors and updated several references (matching De Wit et al. (2024)).

The research presented in this dataset is part of a PhD research (K. de Wit; Utrecht University) within the project Living on Soft Soils: Subsidence and Society (grantnr.: NWA.1160.18.259). This project is funded by the Dutch Research Council (NWO-NWA-ORC), Utrecht University, Wageningen University, Delft University of Technology, Ministry of Infrastructure & Water Management, Ministry of the Interior & Kingdom Relations, Deltares, Wageningen Environmental Research, TNO-Geological Survey of The Netherlands, STOWA, Water Authority: Hoogheemraadschap de Stichtse Rijnlanden, Water Authority: Drents Overijsselse Delta, Province of Utrecht, Province of Zuid-Holland, Municipality of Gouda, Platform Soft Soil, Sweco, Tauw BV, NAM.