XIII.—<i>The caradoc fauna of Ynys Galed, Caernarvonshire</i>

Harper, Janice

doi:10.1080/00222934708654622

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…Knight (1941) called them flared frills with regular spaced flutes and noted that the transverse lines simulate ammonite sutures. Harper (1947), using an analogy with ammonites, described the folds as forming saddles and lobes. Wahlman (1992) described it as lamellose and corrugated or scalloped, whereas Ebbestad (1999a) used crenulated flarings.…”

Section: Methodsmentioning

confidence: 99%

Phragmolites (Gastropoda) from the Late Ordovician of the Peruvian Altiplano

Ebbestad

Gutiérrez-Marco

2019

J. Paleontol.

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Phragmolites lissoni new species is described from 11 specimens found in the Sandbian Calapuja Formation near Calapuja in Peru. The deposits are part of the Central Andean Basin. This is the hitherto only systematically described Ordovician gastropod from Peru. The species is from a brachiopod-dominated siliciclastic sequence and is associated with bryozoans. Most specimens are preserved as external molds, but latex casts yield excellent details of shell ornamentation and are used as a basis for evaluating this feature in the genus. The characteristic ornamentation of Phragmolites should be called corrugated lamellae, and the individual elements on these should be referred to as flutes. A descriptive terminology for these is suggested. The development and shape of the corrugated lamellae and flutes could be biomechanical process. A second component in lamellar formation is the alternation between regular incremental growth and formation of a lamella. Phragmolites is mainly found in shallow-water carbonate facies from tropical latitudes in the Sandbian and a mid-latitude presence in Peru is unexpected. Brachiopods from the same section in Calapuja show affinities with faunas of the Mediterranean margin of Gondwana but also weak links with Avalonia. Phragmolites is found abundantly in deeper-water facies in Laurentia, and a broad tolerance to facies and temperature and possible planktotrophy might have allowed a wide geographical dispersal of the genus. The scant record of Ordovician gastropods in the Central Andean Basin precludes comparison with the disparate record of the Ordovician gastropod taxa from the Precordillera, which do not include Phragmolites.UUID: http://zoobank.org/References/fbd7a43e-a610-42fd-a31d-b1a16fa69c9b

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Section: Methodsmentioning

confidence: 99%

Phragmolites (Gastropoda) from the Late Ordovician of the Peruvian Altiplano

Ebbestad

Gutiérrez-Marco

2019

J. Paleontol.

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“…In fact a shelly fauna of Lower Longvillian age occurs at Ynys Galed only about two miles to the ESE in ashy sediments apparently towards the top of this volcanic series (Harper 1947), and shows its age to be the same as the lower part of the volcanic, series all the way between Snowdon to the east and Llanbedrog to the southwest.…”

Section: The Geology Of the Clynnog-fawr District (E) Comparison Withmentioning

confidence: 96%

“…Although palaeontological evidence of the age of the volcanic series is not present in this area, there can be little doubt that it is of the same general age as the volcanic rocks of the Moel Hebog and Snowdon areas to the east and the Pwllheli-Bodfean area to the west (Harper in Tremlett 1962, p. 176). In fact a shelly fauna of Lower Longvillian age occurs at Ynys Galed only about two miles to the ESE in ashy sediments apparently towards the top of this volcanic series (Harper 1947), and shows its age to be the same as the lower part of the volcanic, series all the way between Snowdon to the east and Llanbedrog to the southwest.…”

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confidence: 93%

The geology of the Clynnog‐fawr district and Gurn Ddu hills of Northeast Lleyn

Tremlett

1964

Geological Journal

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This area of Wales is a westerly continuation of the northern limb of the Snowdon syncline and stretches from the Pre-Cambrian volcanic series in the north to just above the abbreviated Snowdon Volcanic Series in the south. Large parts of the intervening area consist of Caledonian intrusive rocks, but the middle part of the sedimentary succession has yielded scattered graptolites, most and probably all, of Llanvirn age. The exposed volcanic rocks are largely of ignimbrite character while the Caledonian intrusions are of four types (for which chemical analyses are given). The sequence of these four rocktypes and of the structural events of the district is considered.

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The ordovician succession near llanystwmdwy caernarvonshire

Harper¹

1954

Geological Journal

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XIII.—The caradoc fauna of Ynys Galed, Caernarvonshire

Cited by 7 publications

References 10 publications

Phragmolites (Gastropoda) from the Late Ordovician of the Peruvian Altiplano

Phragmolites (Gastropoda) from the Late Ordovician of the Peruvian Altiplano

The geology of the Clynnog‐fawr district and Gurn Ddu hills of Northeast Lleyn

The ordovician succession near llanystwmdwy caernarvonshire

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