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183:. The unnamed lower member is a hard platy shale alternating with beds of tuffaceous mudstones and sandstones, the Kamirawan member is a tuffaceous sandstone with pumice, the Lower Hard Shale is a very siliceous hard shale with tuffaceous sandstones and mudstones, and the Middle Hard Shales and the Upper tuffaceous siltstone are similar.
281:
Funakawa, Satoshi (30 December 1995). "Intrageneric variation and temporal change in the internal skeletal structure of plagiacanthids (Radiolaria) from
Hokkaido, Japan".
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Tsai, Cheng-Hsiu; Ando, Tatsuro (14 April 2015). "Niche
Partitioning in Oligocene Toothed Mysticetes (Mysticeti: Aetiocetidae)".
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257:"Oligo-Miocene Kawakami Group in Eastern Hokkaido - The age and horizon of Ashoro fossil fauna -"
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153:. The formation is fossil rich and contains source units where toothed baleen whales (
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unnamed, Kamirawan, Lower Hard Shale, Middle Hard Shales, Upper tuffaceous silstone
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Transactions and
Proceedings of the Palaeontological Society of Japan
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The
Morawan Formation is a very siliceous unit containing hard platy
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Inoue, Eiji; Suzuki, Taisuke (1961). "Explanatory Text".
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186:Fossil species from the Morawan Formation include:
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232:"Fossil Works Morawan Formation"
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390:Oligocene paleontological sites
298:Journal of Mammalian Evolution
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335:. Geological Survey of Japan.
355:Geologic formations of Japan
285:. New Series (180): 208–225.
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261:Geological Survey of Japan
86:500 m (1,600 ft)
310:10.1007/s10914-015-9292-y
23:
360:Paleogene System of Asia
333:Geological Map of Japan
161:have been discovered.
77:Hombetsuzawa Formation
395:Paleontology in Japan
199:Morawanocetus yabukii
133:age siliceous marine
385:Sandstone formations
135:geological formation
380:Mudstone formations
192:Ashorocetus eguchii
151:Hokkaido prefecture
25:Stratigraphic range
206:Aetiocetus tomitai
168:interbedded with
127:Morawan Formation
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19:Morawan Formation
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375:Shale formations
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67:Kiroro Formation
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365:Paleogene Japan
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212:A. polydentatus
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370:Chattian Stage
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147:Kawakami Group
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264:. Retrieved
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239:. Retrieved
236:Fossil Works
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155:Aetiocetidae
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266:31 December
241:17 December
179:, and some
149:of eastern
349:Categories
218:References
177:sandstones
170:tuffaceous
304:: 33–41.
173:mudstones
145:Japanese
83:Thickness
63:Underlies
55:Sub-units
39:Formation
400:Hokkaido
318:14470974
131:Chattian
100:Hokkaido
91:Location
73:Overlies
29:Chattian
143:Miocene
137:of the
106:Country
45:Unit of
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181:pumice
166:shales
157:) and
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96:Region
314:S2CID
139:Oligo
129:is a
118:Japan
268:2015
243:2021
175:and
125:The
35:Type
306:doi
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