Molluscan paleontology of the lower Miocene Clallam Formation, northwestern Washington

Addicott, Warren O.

doi:10.3133/pp976

Cited by 13 publications

(18 citation statements)

References 10 publications

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“… Literature sources: North‐east Pacific: Addicott (1970); Addicott (1976); Allison & Marincovich (1982); Clark & Arnold (1923); Coan et al . (2000); Grant & Gale (1931); Hertlein (1937); Marincovich (1977, 1981, 1983, 1988); Smith (1991).…”

Section: Resultsmentioning

confidence: 99%

The evolution of gigantism on temperate seashores

Vermeij

2012

Biol J Linn Soc Lond

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The extent to which animal lineages achieve large body size, a trait with broad advantages in competition and defence, varies in space and time according to the supply of (and demand for) resources, as well as the magnitude and effects of extinction. Using the maximum sizes of shallow-water marine shell-bearing molluscs belonging to nineteen guilds (groups of species with similar habits and food sources) in seven temperate regions from the Early Miocene to the Recent, the present study examined the controls on productivity and predation that enable and compel large size to evolve. The North Pacific (especially its eastern sector) has been most favourable to large-bodied species from the Pliocene onward. Large productive kelps (Laminariales) evolved there in conjunction with herbivorous mammals, setting the stage through positive feedbacks between production and consumption for the evolution of large molluscan herbivores and suspension-feeders. The evolution of bottom-feeding predatory mammals together with other large predators created intense selection for large molluscan sizes. Very large molluscs in the Early Miocene were concentrated in the southern hemisphere, especially among metabolically passive species. Extinctions, which preferentially targeted the largest members of guilds in most regions, were more numerous in the southern hemisphere and the North Atlantic than in the North Pacific. Minimal disruption, together with the early evolution of metabolically-active consumers and the positive feedbacks they engendered, accounts for the evolution of molluscan gigantism in the North Pacific.

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Section: Resultsmentioning

confidence: 99%

The evolution of gigantism on temperate seashores

Vermeij

2012

Biol J Linn Soc Lond

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“…The Makah Formation includes a major submarine landslide deposit (the Jansen Creek Member) that is composed of sediments derived from southern Vancouver Island (Niem and others, 1989). This basin shoaled in the early Miocene, and nearshore coal, sandstone, and conglomerate of the Clallam Formation were deposited (Gower, 1960;Addicott, 1976).…”

Section: Basin Developmentmentioning

confidence: 99%

“…Although most strata of this age are restricted to the shelf, upper Miocene shallow-water sandstone and siltstone occur in a small isolated basin along the west side of the Olympic Peninsula in the lower Bogachiel River Valley (Rau, 1979), and in fault-bounded blocks along the coast north of Taholah (Rau, 1970;. Upper Miocene strata also crop out on the southern Oregon coast near Coos Bay (Addicott, 1976;Armentrout, 1980).…”

Section: Basin Developmentmentioning

confidence: 99%

Cenozoic evolution of the continental margin of Oregon and Washington

Snavely¹,

Wells²

1991

Open-File Report

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“…Shoaling and filling in early Miocene time were marked by deposition of shallow-water and nonmarine strata of the overlying Clallam Formation (Gower, 1960;Addicott, 1976).…”

Section: Paleogeologymentioning

confidence: 99%

Makah Formation — A deep-marginal-basin sequence of late Eocene and Oligocene age in the northwestern Olympic Peninsula, Washington

Snavely¹,

Niem²,

MacLeod³

et al. 1980

Professional Paper

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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 occurs within the lower part of the Makah Formation except in the central part of the study area, where it forms the contact between the older Hoko River Formation and the Makah. Foraminiferal faunas indicate that the Makah Formation ranges in age from late Eocene (late Narizian) to late Oligocene (Zemorrian) and was deposited in a predominantly lower to middle bathyal environment. The Makah Formation is part of a deep-marginalbasin facies that crops out in the western part of the Olympic Peninsula, in southwesternmost Washington and coastal embayments in northwestern Oregon, and along the central part of the coast of western Vancouver Island. On the basis of limited subsurface data from exploratory wells, correlative deep-marginal-basin deposits underlie the inner continental shelf of Oregon and the continental shelf (Tofino basin) along the southwestern side of Vancouver Island. Directional structures in the Makah Formation indicate that the predominantly lithic arkosic sandstone that forms the turbidite packets was derived from the northwest. A possible source of the clastic material is the dioritic, granitic, and volcanic terranes in the vicinity of the Hesquiat Peninsula and Barkley Sound on the west coast of Vancouver Island. Vertical and lateral variations of turbidite facies suggest that the four packets of sandstone were formed as depositional lobes on an outer submarine fan. The thin-bedded strata between the turbidite packets have characteristics of basin-plain and outer-fan fringe deposits.

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Molluscan paleontology of the lower Miocene Clallam Formation, northwestern Washington

Cited by 13 publications

References 10 publications

The evolution of gigantism on temperate seashores

The evolution of gigantism on temperate seashores

Cenozoic evolution of the continental margin of Oregon and Washington

Makah Formation — A deep-marginal-basin sequence of late Eocene and Oligocene age in the northwestern Olympic Peninsula, Washington

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