Qualla: Kitadani Formation

Kitadani Formation: Introduction

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Palaeotaku, CC BY 4.0. Somewhere around 120 million years ago, a river system wound through what is now Fukui Prefecture, depositing sand, mud, and volcanic ash across a floodplain where dinosaurs hunted, crocodilians basked, and primitive birds left three-toed tracks in soft sediment. That ancient landscape compressed into the Kitadani Formation, a unit of Lower Cretaceous rock that crops out along the Kuzuryu River district near the city of Katsuyama. It is, by any measure, the most important dinosaur-bearing geological formation in Japan, the single richest source of Cretaceous-aged non-marine vertebrate fossils anywhere in the country. Nearly every specimen ends up at the Fukui Prefectural Dinosaur Museum, built just kilometers from the quarry face.

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Image: Palaeotaku | CC BY 4.0

Kitadani Formation: A Window in the Tetori Group

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Hirorinmasa, CC BY-SA 3.0. The Kitadani Formation sits within the Tetori Group, a major sequence of Lower Cretaceous sedimentary rocks distributed across Fukui, Ishikawa, and Gifu prefectures in western-central Honshu, in the region surrounding Mount Haku. The Tetori Group varies dramatically from one area...

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Image: Hirorinmasa | CC BY-SA 3.0

Kitadani Formation: The Bestiary in Stone

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Eight heads serpent, CC0. The fossil record of the Kitadani Formation reads like an inventory of an entire Cretaceous ecosystem. Dinosaurs dominate the headlines: all three major clades, Theropoda, Sauropodomorpha, and Ornithischia, are represented. Six named dinosaur species have been formally described ...

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Image: Eight heads serpent | CC0

Kitadani Formation: Footprints of Ghosts

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Takashi OTA, CC BY 2.5. Beyond bones and teeth, the Kitadani Formation preserves something rarer: the traces of living animals caught in motion. Ichnofossils, fossilized tracks and traces, have been recovered from multiple horizons. Ornithopod tracks record the passage of herbivorous dinosaurs. Small to...

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Image: Takashi OTA | CC BY 2.5

Kitadani Formation: Climate Written in Pollen

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Alexrk2, CC BY-SA 3.0. The Kitadani Formation tells a climate story as well as a biological one. A 2013 palynological study identified gymnosperms and freshwater algae in abundance, along with epiphyllous fungi, but found no angiosperm pollen at all. Branches of the conifer Brachyphyllum obesum recover...

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Image: Alexrk2 | CC BY-SA 3.0