Bolide Impact Origin of Norwegian Fjords: Physical Model, Erosion Mechanics, and Implications for Global Fjord Formation

Norwegian fjords concentrate on Atlantic-facing coasts, achieve bedrock depths exceeding 1,500 m with no direct geochronological evidence for progressive multi-cycle glacial carving, and exhibit orientations that in the case of Sognefjord bear no clear relation to the Caledonian fold structure through which the fjord cuts (Nesje & Whillans, 1994). Glacial erosion accounts for only 35–55% of the offshore sediment volume deposited during the Plio-Quaternary in western Scandinavia (Steer et al., 2012). We propose that Norwegian fjords were carved from pre-existing tectonic fracture valleys by bolide-generated mega-tsunami, with glacial modification occurring during subsequent ice occupation of the pre-existing channels. We develop a physical model for the formation of the Møre og Romsdal fjords by trans-Atlantic mega-tsunami generated by the candidate Younger Dryas bolide swarm impact at ~12,800 BP (Gjøvik, 2026). The Boston Basin drumlin field — over 200 drumlins extending at least 16 km seaward into Massachusetts Bay (La Forge, 1932; Rosen & FitzGerald, 2004) — constrains the swarm to approximately 200 fragments across a ~50 km zone, with 30–50 fragments impacting shallow marine environment directly. Three independent wave generation mechanisms operate simultaneously: direct marine displacement, catastrophic meltwater release from ~8–9 km³ of vaporized glacier, and atmospheric blast coupling at ~68× Krakatoa energy. The distributed swarm generates a quasi-planar wavefront that preserves amplitude across trans-Atlantic distance more efficiently than a point source. Energy analysis yields coastal wave heights of 15–40 m, amplifying through fjord geometry to flow velocities of 30–85 m/s — exceeding catastrophic plucking thresholds by factors of 3–17×. Dam spillway engineering data, including 90 m of bedrock scour at Kariba Dam and removal of 1,200-tonne boulders at Wivenhoe Dam at velocities below 25 m/s (Stratford et al., 2013; Bollaert, 2004), confirm that erosion at these velocity scales exceeds engineering predictions. Norwegian fjord groups have distinct orientations, each facing a water body containing a confirmed impact structure — the Barents Sea (Mjølnir, 142 Ma), the North Sea (Silverpit, 43–46 Ma), and the Atlantic (Boston Basin, proposed ~12,800 BP) — with fjord morphology correlating to impact age despite uniform gneissic bedrock across regions. The three partially submerged drumlin fields documented worldwide — Boston Harbor, Clew Bay (Ireland), and Fláajökull (Iceland) — all lie on the North Atlantic propagation path between the proposed impact site and the Norwegian coast. Globally, every major fjord coastline faces an ocean basin with documented Quaternary-age impact history. This paper presents a detailed case study of Western Norway including Møre og Romsdal and call for researchers to evaluate the mechanism at other fjord coastlines worldwide. Additional Resources: A PDF version is available here. Gjøvik, Ashley M. “Identification of a New England Bolide Impact Site: A Geologic Reckoning with the Ground-Zero for the Younger Dryas Impact Event”. The Journal of Decolonized Ecology and Evolution 1, no. 1 (March 21, 2026). https://doi.org/10.5281/zenodo.19146482. Change.org Petition for a Formal Reassessment of the Geology of the Boston Basin (Massachusetts), https://www.change.org/p/petition-for-a-formal-reassessment-of-the-geology-of-the-boston-basin-massachusetts