1980
DOI: 10.3133/pp1162b
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Makah Formation — A deep-marginal-basin sequence of late Eocene and Oligocene age in the northwestern Olympic Peninsula, Washington

Abstract: The Makah Formation of the Twin River Group crops out in a northwest-trending linear belt in the northwesternmost part of the Olympic Peninsula, Wash. This marine sequence consists of 2800 meters of predominantly thin-bedded siltstone and sandstone that encloses six distinctive newly named members four thick-bedded amalgamated turbidite sandstone members, an olistostromal shallow-water marine sandstone and conglomerate member, and a thin-bedded water-laid tuff member. A local unconformity of submarine origin o… Show more

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Cited by 36 publications
(47 citation statements)
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“…These sediments were deposited in bathyal depths and for the last 35 Myr have been accreted to the accretionary wedge and uplifted by the ongoing subduction of the Juan de Fuca plate under the North American continent (Rau 1966;Snavely et al 1978;Snavely et al 1980;Batt et al 2001;Stewart & Brandon 2004). These thick sediment sequences are generally fossilpoor, monotonous, thick-bedded silt-and mudstones, but contain also calcareous concretions with whale bones and wood associated with fossil mollusc assemblages that resemble those of modern whale-and wood-falls.…”
Section: Methodsmentioning
confidence: 99%
“…These sediments were deposited in bathyal depths and for the last 35 Myr have been accreted to the accretionary wedge and uplifted by the ongoing subduction of the Juan de Fuca plate under the North American continent (Rau 1966;Snavely et al 1978;Snavely et al 1980;Batt et al 2001;Stewart & Brandon 2004). These thick sediment sequences are generally fossilpoor, monotonous, thick-bedded silt-and mudstones, but contain also calcareous concretions with whale bones and wood associated with fossil mollusc assemblages that resemble those of modern whale-and wood-falls.…”
Section: Methodsmentioning
confidence: 99%
“…The lower Oligocene to lowermost Miocene Pysht Formation directly overlies the Makah Formation on the north side of the Olympic Peninsula (Snavely et al, 1980). Like the Makah Formation examples, four fossil cetaceans collected from the Pysht Formation also have unusual invertebrate associations (Table 1).…”
Section: Pysht Formationmentioning
confidence: 99%
“…Rare allochthonous masses of limestone contain an invertebrate assemblage that indicates cold-methane seeps supported localized chemosymbiotic molluscan communities on the shelf/slope near the basin that contained the whale carcasses (Goedert and Campbell, 1995). Benthic foraminifers from this part of the formation indicate an age ranging from late Eocene to late Oligocene (Snavely et al, 1980;Armentrout et al, 1983); however, mollusks support a late early to early late Oligocene age assignment (Squires and Goedert, 1994).…”
Section: Makah Formationmentioning
confidence: 99%
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“…Not only is the Makah Formation fossiliferous with mollusks [8,28], crustaceans [8,[29][30][31][32][33][34][35], and benthic foraminifera [8], but it also yields it also yields birds [36], terrestrial plants [37][38][39], and some of the earliest known fossils of baleen and toothed whales [23]. Some of these fossils come from apparent chemosymbiotic communities [40][41][42], including communities that are apparently associated with decaying whale carcasses and sunken wood [22,[43][44][45].…”
Section: Geologic Settingmentioning
confidence: 99%