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- The Yezo Group is a stratigraphic group in Hokkaido, Japan and Sakhalin, Russia which is primarily Late Cretaceous in age (Aptian to Earliest Paleocene). It is exposed as roughly north–south trending belt extending 1,500 kilometres through central Hokkaido from Urakawa to Cape Sōya and Sakhalin from the south coast to Alexandrovsk-Sakhalinsky District. It consists of marine forearc basin sediments, typically turbiditic and bioturbated mudstones and sandstones with subordinate conglomerate primarily deposited on the continental shelf and slope of the ancient Yezo subduction margin. It forms a continuous depositional sequence with the , which overlies the Horokanai Ophiolite. The sequence gradually shallows upwards with the terminal Hakobuchi Formation representing a fluvial-inner shelf environment. Numerous fossils are known from the unit, mostly ammonites and bivalves, but also marine vertebrates such as mosasaurs, plesiosaurs and marine turtles. Dinosaur remains are among the fossils that have been recovered from the group. These include a partial cervical vertebra and right hand from the therizinosaurid Paralitherizinosaurus, from Early Campanian from northern Hokkaido. Nipponosaurus is known from an unnamed unit of the group from Southern Sakhalin, probably late Santonian or early Campanian in age. Kamuysaurus, which is known from the early Maastrichtian Hakobuchi Formation of southern Hokkaido, was also discovered in layers of this group. (en)
- 蝦夷層群（えぞそうぐん）は、北海道浦河町から稚内市の宗谷岬を通りロシア連邦サハリン州西部アレクサンドロフスク・サハリンスキーまで北海道中軸部を貫くように分布する、前期白亜紀アプチアン期から古第三紀暁新世にかけて堆積した海成層の地層。アジア大陸東岸の前弧海盆に堆積し、全層厚は約10,000メートルに達する。 (ja)
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- 蝦夷層群（えぞそうぐん）は、北海道浦河町から稚内市の宗谷岬を通りロシア連邦サハリン州西部アレクサンドロフスク・サハリンスキーまで北海道中軸部を貫くように分布する、前期白亜紀アプチアン期から古第三紀暁新世にかけて堆積した海成層の地層。アジア大陸東岸の前弧海盆に堆積し、全層厚は約10,000メートルに達する。 (ja)
- The Yezo Group is a stratigraphic group in Hokkaido, Japan and Sakhalin, Russia which is primarily Late Cretaceous in age (Aptian to Earliest Paleocene). It is exposed as roughly north–south trending belt extending 1,500 kilometres through central Hokkaido from Urakawa to Cape Sōya and Sakhalin from the south coast to Alexandrovsk-Sakhalinsky District. It consists of marine forearc basin sediments, typically turbiditic and bioturbated mudstones and sandstones with subordinate conglomerate primarily deposited on the continental shelf and slope of the ancient Yezo subduction margin. It forms a continuous depositional sequence with the , which overlies the Horokanai Ophiolite. The sequence gradually shallows upwards with the terminal Hakobuchi Formation representing a fluvial-inner shelf envi (en)
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