Marine reservoir correction for the Pacific coast of central Japan using 14C ages of marine mollusks uplifted during historical earthquakes

AbstractIn this study we utilize marine shell samples from two levels of historically uplifted sessile mollusk assemblages and raised wave-cut benches to evaluate the marine reservoir correction (ΔR) for the Pacific coast of central Japan. Elevation measurements of the uplifted marine shells indicate that the lower assemblage emerged during the 1923 Taisho Kanto earthquake (M7.9), whereas uplift of the upper assemblage is most likely but less confidently ascribed to the 1703 Genroku Kanto earthquake (M8.2). Radiocarbon dating of carefully selected samples from the upper and lower assemblages yielded very similar ΔR values of 82 ± 33 and 77 ± 32 yr, respectively. We regard the former ΔR value as a representative and more reliable value given the uncertainty in correlation of the upper assemblage with the 1703 earthquake. This result is consistent with previously reported ΔR values for the Pacific coast of south-central Japan and areas around the Sea of Japan that are influenced by warm ocean currents. Radiocarbon dating of coseismically uplifted shells can aid in estimating marine reservoir ages in the tectonically active Japan Islands.

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Long-term trends in food habits of Asiatic black bears in the Misaka Mountains on the Pacific coast of central Japan

Mammalian Biology ◽

10.1016/j.mambio.2009.03.008 ◽

2010 ◽

Vol 75 (1) ◽

pp. 17-28 ◽

Cited By ~ 54

Author(s):

Shinsuke Koike

Keyword(s):

Food Habits ◽

Pacific Coast ◽

Black Bears ◽

Central Japan ◽

The Pacific ◽

Long Term Trends

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Two new species of Microcotyle (Monogenea: Microcotylidae) on intertidal fish from the south Pacific coast

Revista de biología marina y oceanografía ◽

10.22370/rbmo.2019.54.3.2015 ◽

2020 ◽

Vol 54 (3) ◽

pp. 283

Author(s):

Gabriela Muñoz ◽

Mario George-Nascimento

Keyword(s):

New Species ◽

Pacific Coast ◽

Valid Species ◽

Base Pairs ◽

Central Chile ◽

South Central ◽

The Pacific ◽

The Family ◽

Two New Species ◽

Intertidal Fish

Microcotyle is one of the most diverse and controversial genera within the family Microcotylidae. To date, 131 species have been described in Microcotyle; however, more than half have been transferred to other genera, and several others have poor descriptions. Therefore, less than half of all Microcotyle species may be considered valid. In Chile, two species have been recognized, and unidentified Microcotyle have been found on several littoral fish, but there has been no effort to properly identify them. In this study, two new species of Microcotyle are taxonomically described from intertidal fish of the central (33°S) and south-central (36°S) regions of Chile. In this study, Microcotyle sprostonae n. sp. (collected mainly from Scartichthys viridis in central Chile) and M. chilensis n. sp. (collected mainly from Calliclinus geniguttatus in south-central Chile) were identified based on morphological and molecular analyses (ITS2 and 18S genes). Both species of Microcotyle principally differed from one another and from other valid species in the number of testes and clamps. The two new species also differed from one another by one base pair in the ITS2 and 18S genes and differed from other species of Microcotyle by several base pairs of both genes. Intertidal fish are mostly endemic to the Pacific coast of South America, and they have a limited geographical distribution that does not overlap with the type hosts of other Microcotyle species. Therefore, the two new species described here are distinguished from other congeneric species by morphological, genetic, and biological characteristics.

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Radiolarian Fossils from Conglomerate Layers of the Upper Cretaceous Nakaminato Group Exposed Along the Pacific Coast of Ibaraki Prefecture, Central Japan: Staged Denudation of the Mid-Mesozoic Accretionary Complexes in the Kanto District

Paleontological Research ◽

10.2517/2017pr026 ◽

2018 ◽

Vol 22 (4) ◽

pp. 307-325 ◽

Cited By ~ 2

Author(s):

Hiroaki Inose ◽

Kaoru Furuuchi ◽

Tsuyoshi Ito ◽

Katsuo Sashida ◽

Sachiko Agematsu

Keyword(s):

Upper Cretaceous ◽

Pacific Coast ◽

Central Japan ◽

The Pacific ◽

Kanto District ◽

Ibaraki Prefecture

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Late Pleistocene stratigraphy of south-central British Columbia

Canadian Journal of Earth Sciences ◽

10.1139/e78-105 ◽

1978 ◽

Vol 15 (6) ◽

pp. 971-980 ◽

Cited By ~ 49

Author(s):

Robert J. Fulton ◽

Geoffrey W. Smith

Keyword(s):

British Columbia ◽

North America ◽

Great Lakes ◽

Late Pleistocene ◽

Pacific Coast ◽

Coastal Regions ◽

South Central ◽

The Pacific ◽

Valley Area ◽

Coast Region

The late Pleistocene deposits of south-central British Columbia record two major glacial and two major nonglacial periods of deposition. The oldest recognized Pleistocene deposits, called Westwold Sediments, were deposited during a nonglacial interval more than 60 000 years ago. Little information is available on the climate of this period, but permafrost may have been present at one time during final stages of deposition of Westwold Sediments. The latter part of this nonglacial period is probably correlative with the early Wisconsin Substage of the Great Lakes – St. Lawrence Valley area. However, deposition of the Westwold Sediments may have begun during the Sangamon Interglacial.Okanagan Centre Drift is the name applied to sediments deposited during the glaciation that followed deposition of Westwold Sediments. Okanagan Centre Drift is known to be older than 43 800 years BP and probably is older than 51 000. It is considered to correlate with an early Wisconsin glacial period.Bessette Sediments were deposited during the last major nonglacial period, which in south-central British Columbia persisted from at least 43 800 years BP (possibly more than 51 000) to about 19 000 years BP. This episode corresponds to Olympia Interglaciation of the Pacific Coast region and the mid-Wisconsin Substage of the Great Lakes – St. Lawrence Valley area. During parts of Olympia Interglaciation the climate was probably as warm as the present-day climate in the interior of British Columbia. Information from coastal regions indicates that there may have been periods of cooler and moister climate.Kamloops Lake Drift was deposited during the last major glaciation of south-central British Columbia. Ice occupied lowland areas from approximately 19 000 to 10 000 years BP. This period corresponds approximately to the Fraser Glaciation of the Pacific Coast region and the late Wisconsin Substage of central and eastern parts of North America.

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