Hashiura Group

Geology

Formations: Arato (2), Aratozaki (2)

Lithologies: "shale" (2), sandstone (4), conglomerate (2)

Paleoenvironments: marine indet. (4)

Age range: base of the Early/Lower Bajocian to the top of the Oxfordian or 170.90000 to 154.80000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Early/Lower Bajocian170.9 - 168.6Japan (Miyagi) (39978)
Bajocian170.9 - 168.2Japan (Miyagi) (40543)
Callovian165.3 - 161.5Japan (Miyagi) (39977)
Oxfordian161.5 - 154.8Japan (Miyagi) (39648)