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A total of 1500 samples were analysed by inductively coupled plasma optical emission spectrometry (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS), with data acquired for 48 elements, ranging from Na to U in the periodic table. The aim was to utilize chemostratigraphy, in conjunction with existing biostratigraphic, lithostratigraphic and sedimentological data, to define the Hercynian Unconformity in each well and to recognize stratigraphic boundaries occurring above and below it. This was necessary as the unconformity eroded to different stratigraphic levels in each well, with Devonian, Silurian and Ordovician sediments found immediately below it in adjacent locations. In the absence of chemostratigraphic, biostratigraphic and sedimentological data, it is often very difficult to define this boundary and others using lithostratigraphy alone as many stratigraphic intervals yield similar gamma-ray (GR) log trends. For example, a low \u2018blocky\u2019 GR response is typical of both the Carboniferous Ghazal Member and the Ordovician Sarah Formation. Similarly, both the Silurian Sharawra Member and the Silurian\u2013Devonian Tawil Formation produce a \u2018ratty\u2019 GR trend. Each stratigraphic member and formation was found to have distinctive chemostratigraphic, biostratigraphic, sedimentological and\/or wireline log signatures.<\/jats:p>","DOI":"10.1144\/petgeo2019-116","type":"journal-article","created":{"date-parts":[[2019,12,19]],"date-time":"2019-12-19T16:25:17Z","timestamp":1576772717000},"page":"568-588","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Definition of the Hercynian Unconformity in eastern Saudi Arabia using chemostratigraphy in conjunction with biostratigraphy, sedimentology and lithostratigraphy"],"prefix":"10.1144","volume":"26","author":[{"given":"Neil W.","family":"Craigie","sequence":"first","affiliation":[]}],"member":"1881","published-online":{"date-parts":[[2020,2,6]]},"reference":[{"key":"e_1_3_4_2_1","volume-title":"Stratigraphic Palynology of the Palaeozoic of Saudi Arabia","author":"Al-Hajri S.","year":"2000","unstructured":"Al-Hajri, S. & Owens, B. 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