Supplementary files for: Applying geotechnical borehole databases in the search for interglacial deposits in Denmark

Geotechnical investigations conducted in preparation for infrastructure development provide high-quality borehole data in standardised digital formats. In Denmark, such geotechnical borehole data are not required to be reported to the national well database (Jupiter) and are mainly archived in privately owned databases. Accessible interglacial and interstadial terrestrial deposits are rare in Denmark, and these borehole data have the potential to identify interglacial and interstadial deposits, with significant implications for ongoing palaeoclimate, palaeoenvironmental and archaeological research. In this study, we compiled data from six major geotechnical companies, resulting in a database with over 550 000 boreholes. From this database, we identified 1850 boreholes containing samples associated with interglacial and interstadial ages. Through extensive filtering for well-documented lacustrine or palustrine deposits, we selected 161 boreholes and referenced them to 39 different geographical occurrences. Of these 39 occurrences, 36 were either new terrestrial deposits or provided substantial new records to known interglacial and interstadial sites. Our findings demonstrate that access to these privately owned geotechnical borehole data can be a valuable resource for identifying rare near-surface geological deposits, allowing the discovery of several new Pleistocene sedimentary archives that warrant further investigation.

为基础设施开发而进行的岩土工程调查提供了高质量的标准化数字格式的钻孔数据。在丹麦，此类岩土工程钻孔数据无需上报至国家井数据库（Jupiter），而主要存档于私人拥有的数据库中。丹麦境内可获取的冰后期和间冰期的陆相沉积物较为罕见，这些钻孔数据具有识别冰后期和间冰期沉积物的潜力，对持续的古气候、古环境和考古学研究具有重大意义。在本研究中，我们收集了六家主要岩土工程公司的数据，构建了一个包含超过550,000个钻孔的数据库。从该数据库中，我们确定了1,850个与冰后期和间冰期年龄相关的钻孔样本。通过对具有详尽记录的湖泊或沼泽沉积物进行广泛筛选，我们选出了161个钻孔，并将其与39种不同的地理出现地点进行参照。在这39个地点中，有36个要么是新发现的陆相沉积物，要么为已知的冰后期和间冰期遗址提供了大量新记录。我们的研究结果表明，访问这些私人拥有的岩土工程钻孔数据可以作为识别罕见的近地表地质沉积物的宝贵资源，允许发现多个新的更新世沉积物档案，这些档案值得进一步研究。