A study of the Adaffa Formation interprets its depositional settings as ranging from supratidal marine to fluvial environments, with coarse sediment supplied by braided-river outlets fed by periodic flash floods.
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Elasmosaurid plesiosaur remains are recorded from the Late Cretaceous (Campanian–Maastrichtian) Adaffa Formation of north-western Saudi Arabia, in the first detailed report of late Mesozoic marine reptiles from the Arabian Peninsula.
Evidence: SRC-031 · SRC-030Statement code:
Approved version OWNER-REVIEW-20261104T083428640 · last approved 4 November 2026