A palaeokarst of probable Kainozoic age preserved in Cambrian marble at Cemaes Bay, Anglesey, North Wales

Morawiecka, Iwona; Slipper, Ian J.; Walsh, Peter

doi:10.1127/zfg/40/1996/47

Cited by 9 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1). The solution pipes developed in a Neoproterozoic limestone megaclast of the Gwna Group mélange that contain multi-coloured clays and breccia (Morawiecka et al 1996;Horák and Evans 2011) Palynological analysis of a black clay from the composite pipe 11/12 yielded a palynoflora of 62 taxa (Table 1) (Walsh et al 1996). This palynological assemblage was dominated by Pinuspollenites spp.…”

Section: Introductionmentioning

confidence: 99%

Palaeoclimate reconstruction and age assessment of the Miocene flora from the Trwyn y Parc solution pipe complex of Anglesey, Wales, UK

Pound

McCoy

2021

Palynology

View full text Add to dashboard Cite

The Trwyn y Parc solution pipes on the Isle of Anglesey, Wales, UK are one of only three onshore Miocene fossil flora bearing sites. Here we revise the palynostratigraphy and present new palaeoclimate data for this geoheritage site. By comparison to palynological data from northern Europe the age has been refined from Miocene to Middle Miocene, possibly Langhian. This is confirmed by palaeoclimate reconstructions comparable to the German Middle Miocene, especially the Langhian after the Middle Miocene Climatic Optimum (MMCO). This new information not only confirms the regional importance of Trwyn y Parc, but shows it to be of national importance Our findings show that this Regionally Important Geodiversity Site (RIGs) is of national importance as it is the oldest onshore fossiliferous Neogene deposit in the UK. Based on this, and the unique fossil flora preserved at Trwyn y Parc, the site has significant geoheritage value and should be upgraded to Geological Conservation Review (GCR) status and subsequently protected as a Site of Special Scientific Interest (SSSI).

show abstract

Section: Introductionmentioning

confidence: 99%

Palaeoclimate reconstruction and age assessment of the Miocene flora from the Trwyn y Parc solution pipe complex of Anglesey, Wales, UK

Pound

McCoy

2021

Palynology

View full text Add to dashboard Cite

show abstract

The Cwm Llwyd Outlier, Carmarthenshire, South‐West Wales – Britain's deepest karstic subsidence or Variscan pull‐apart structure?

Walsh¹,

Barclay²,

Battiau-Queney³

2006

Geological Journal

View full text Add to dashboard Cite

The Cwm Llwyd Outlier of Namurian Middle Shales in the central part of the Black Mountain escarpment of South Wales is an unusual structure. It occupies a topographic depression located more than 2 km from the main outcrop of the Middle Shales and has a stratigraphic discordance with its wall-rocks of more than 300 m. Previous interpretations advocating a karstic origin imply that this is the deepest known subsidence in Great Britain. However, although the outlier lies among some of the finest epikarst landforms in the country, several factors indicate that the subsidence was not caused by a karstic mechanism. These include the amount of stratigraphic displacement in contrast to the depth of available vertical space in the putative host Carboniferous Limestone, the relatively simple form of the outlier, and the absence of brecciation, marginal solution residues and associated palaeoendokarst features in the adjacent wall-rocks.The outlier is re-interpreted here as the product of faulting which occurred during a Variscan strike-slip or transpressive tectonic regime, producing local sinistral transtension that may have been re-activated in the Palaeogene period. Remapping the outlier at a scale of 1:2 500 indicates that the present structure is related principally to a left-stepping offset between the Cwm Llwyd and Llwyn Celyn faults. Analogies are drawn with the Cainozoic pull-apart structures in Southwest England. Near-surface reddening and kaolinization of the beds probably represent pre-Pleistocene weathering.

show abstract

Long-Term Pre-Quaternary Geomorphic Evolution

Migoń

2020

World Geomorphological Landscapes

View full text Add to dashboard Cite

A palaeokarst of probable Kainozoic age preserved in Cambrian marble at Cemaes Bay, Anglesey, North Wales

Cited by 9 publications

References 0 publications

Palaeoclimate reconstruction and age assessment of the Miocene flora from the Trwyn y Parc solution pipe complex of Anglesey, Wales, UK

Palaeoclimate reconstruction and age assessment of the Miocene flora from the Trwyn y Parc solution pipe complex of Anglesey, Wales, UK

The Cwm Llwyd Outlier, Carmarthenshire, South‐West Wales – Britain's deepest karstic subsidence or Variscan pull‐apart structure?

Long-Term Pre-Quaternary Geomorphic Evolution

Contact Info

Product

Resources

About