Nearshore marine paleoclimatic regions, increasing zoogeographic provinciality, molluscan extinctions, and paleoshorelines, California: late Oligocene (27 Ma) to late Pliocene (2.5 Ma)

Hall, Clarence A.

doi:10.1130/spe357

Cited by 25 publications

(56 citation statements)

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“…During the Miocene, the San Joaquin Basin formed a wide, deep, continent-margin basin off the Pacifi c Ocean (Fig. DR2) as major faults propagated across its southern and western margins (Nilsen, 1996;Hall, 2002). Tectonic activity and eustatic changes caused repeated major sea-level fl uctuation in the basin (Johnson and Graham, 2007).…”

Section: Stratigraphymentioning

confidence: 99%

“…1). During the deposition of these units, major eustatic sea-level changes correspond with the MMCO (Zachos et al, 2001) and tectonic changes along the western margin of the North American plate (Nilsen, 1996;Hall, 2002;Hosford Scheirer and Magoon, 2007).…”

Section: Stratigraphymentioning

confidence: 99%

“…The hypothesis that the San Joaquin Basin was an analog of the gray whale calving grounds of coastal southern California and Baja California (Kellogg, 1927) is not supported by the relative paucity of neonate and/or juvenile specimens in the bonebed quarry samples (6.9%) and the paleobathymetry of the Sharktooth Hill bonebed (Olson, 1990). The depositional environment of the Round Mountain Silt was also more open, offshore, and deeper than the modern lagoonal calving grounds in Baja California (Olson, 1990;Hall, 2002).…”

Section: Previous Hypothesesmentioning

confidence: 99%

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Origin of a widespread marine bonebed deposited during the middle Miocene Climatic Optimum

Pyenson

Irmis

Lipps

et al. 2009

Geology

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Bonebeds are vertebrate bioclast concentrations in beds that are local to basinal in extent. The middle Miocene Sharktooth Hill bonebed in the southeastern San Joaquin Basin of California is among the largest of such deposits, exposed over 15 km and containing a rich assemblage of marine vertebrates, with a mean density of ~200 specimens/m 2 . It ranks among the most widespread and richest bonebeds known, yet its genesis is poorly understood. Hypotheses for its origin and formation include mass death from shark predation, volcanic or red tide poisoning, accumulation from a calving ground for marine mammals, and condensed accumulation over a long period of time. Based on multiple kinds of evidence, we conclude that the bonebed formed over a protracted time interval of little to no net clastic sedimentation, coincident with a signifi cant transgressive-regressive cycle between 16 and 15 Ma ago, during the middle Miocene Climatic Optimum (MMCO). Geochronological constraints bracket the duration of bonebed formation to no longer than 700 ka, indicating that time averaging is a critical consideration for paleoecological analyses of North Pacifi c Ocean biotic richness during the MMCO.

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Section: Stratigraphymentioning

confidence: 99%

Section: Stratigraphymentioning

confidence: 99%

Section: Previous Hypothesesmentioning

confidence: 99%

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Origin of a widespread marine bonebed deposited during the middle Miocene Climatic Optimum

Pyenson

Irmis

Lipps

et al. 2009

Geology

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“…In light of the specific composition and the abundance of warmwater elements, together with their wide distribution in the Holocene sediments, Sandweiss et al suggested that sustained El Niño activity during this period supported the development of permanent populations of these 'tropical' taxa via repeated larval arrivals; that is, the permanency of these populations is substained by periodical larval inputs. In this view, protected environments should have played an important role; however, it is not easy to separate the effects of local palaeogeographical controls from that of the general thermal regime because many of the mollusc species may live in open shallow-water as well as in protected environments (Hall 2002). …”

Section: The Cuesta Del Burro Member Mollusc Assemblagementioning

confidence: 99%

Warm-water mollusc assemblages from northern Chile (Mejillones Peninsula): new evidence for permanent El Niño-like conditions during Pliocene warmth?

Ragaini

Celma

Cantalamessa

2008

JGS

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Although results have been controversial, understanding the tropical Pacific climatic state during the Pliocene warm interval (c. 4.5-3.0 Ma) is crucial if insight is to be gained into the dynamic processes of present and future global warming. In the multi-proxy effort to reconstruct ancient climates, a critical role can be played by palaeoclimatic evidence provided by the spatial and temporal distribution of temperaturesensitive marine molluscs. Shallow-water strata of the Mejillones Peninsula, northern Chile (238S), contain dense faunal assemblages in which molluscs exclusive to, or characteristic of, Pliocene deposits (Chlamys simpsoni, Chlamys vidali, Chorus blainvillei, Concholepas nodosa, Fusinus remondi, Herminespina mirabilis) coexist with surprisingly abundant and varied populations of extant warm-water species (Bulla punctulata, Cerithium stercusmuscarum, Olivella sp., Turbo cf. fluctuosus, Anomia peruviana, Argopecten ventricosus, Donax peruvianus, Dosinia ponderosa, Mexicardia procera, Undulostrea megodon), most of which have their current southern zoogeographical limit at 68S. These tropical elements are reliable indicators of nearshore marine conditions and their abundant occurrence implies that sea surface temperatures (SST) along the northern Chile coast were at least 2 8C warmer in the mid-Pliocene than at present, and that these very different conditions lasted long enough to allow stable colonization of the area. Such a significantly warmer SST pattern strongly resembles general climatic conditions accompanying modern El Niño events, when warm tropical waters propagate southward along the western margin of South America; this supports the existence in this area of persistently El Niño-like conditions during the mid-Pliocene.

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“…The geological history of the islands is not clear. The Þrst emergence of island masses occurred in the Miocene (17Ð13 MYA ;Hall 2002), whereas most of the islands as known today were uplifted in the Pliocene between 5Ð2.5 MYA (Hall 2002). Jacobs et al (2004) indicated that due to the movement of the PaciÞc plate, early island masses rotated away from the San Diego area to their current position between 17 and 12 MYA.…”

mentioning

confidence: 99%

Multi-Island Endemicity: Phylogeography and Conservation of Coelus pacificus (Coleoptera: Tenebrionidae) Darkling Beetles on the California Channel Islands

Chatzimanolis

Norris

Caterino

2010

Annals of the Entomological Society of America

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The California Channel Islands have been the focus of multiple conservation studies on charismatic vertebrates and plant species, but very few studies have focused on insects. In this study we examined the phylogeography of Coelus pacificus Fall (Coleoptera: Tenebrionidae), a dune-inhabiting darkling beetle, endemic to the islands. Our aim in this study is to decipher the relationships between C. pacificus and the congeneric species Coelus ciliatus Eschscholtz that is distributed on the mainland, to examine the biogeographic relationships of the islands and augment the conservation efforts on the islands with insect data. We sequenced 235 specimens of Coelus for the cytochrome oxidase I mitochondrial gene. We performed phylogenetic analyses to assess the historical relationships of the different species and islands. We also examined the connectedness of the islands by using pairwise φst and hierarchical analysis of molecular variance to test alternate hypotheses of geographical structure, Based on the phylogenetic analyses, C. pacificus is a valid, multi-island endemic species. Haplotypes were grouped into two clades: one clade composed of Santa Cruz, Santa Rosa, San Miguel, and San Nicolas; and the other clade composed of Santa Catalina and San Clemente. The highest haplotypic diversity was observed in San Clemente and San Nicolas islands, but all islands had unique haplotypes. Two haplotypes morphologically indistinguishable from C. pacificus formed a sister clade to C. ciliatus, suggesting either an ancient hybridization event or cryptic speciation. The California Channel Islands should be managed on a system wide basis, at least for some of the organisms or habitats and each island's population requires separate management to protect genetic integrity.

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Nearshore marine paleoclimatic regions, increasing zoogeographic provinciality, molluscan extinctions, and paleoshorelines, California: late Oligocene (27 Ma) to late Pliocene (2.5 Ma)

Cited by 25 publications

References 0 publications

Origin of a widespread marine bonebed deposited during the middle Miocene Climatic Optimum

Origin of a widespread marine bonebed deposited during the middle Miocene Climatic Optimum

Warm-water mollusc assemblages from northern Chile (Mejillones Peninsula): new evidence for permanent El Niño-like conditions during Pliocene warmth?

Multi-Island Endemicity: Phylogeography and Conservation of Coelus pacificus (Coleoptera: Tenebrionidae) Darkling Beetles on the California Channel Islands

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