TREAGUS, JACK E., TREAGUS, SUSAN H., WOODCOCK, NIGEL H. (2013) The significance of the boundary between the Rhoscolyn and New Harbour formations on Holy Island, North Wales, to the deformation history of Anglesey. Geological Magazine, 150 (3) 519-535 doi:10.1017/s0016756812000775
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | The significance of the boundary between the Rhoscolyn and New Harbour formations on Holy Island, North Wales, to the deformation history of Anglesey | ||
| Journal | Geological Magazine | ||
| Authors | TREAGUS, JACK E. | Author | |
| TREAGUS, SUSAN H. | Author | ||
| WOODCOCK, NIGEL H. | Author | ||
| Year | 2013 (May) | Volume | 150 |
| Issue | 3 | ||
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s0016756812000775Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 260748 | Long-form Identifier | mindat:1:5:260748:5 |
| GUID | 0 | ||
| Full Reference | TREAGUS, JACK E., TREAGUS, SUSAN H., WOODCOCK, NIGEL H. (2013) The significance of the boundary between the Rhoscolyn and New Harbour formations on Holy Island, North Wales, to the deformation history of Anglesey. Geological Magazine, 150 (3) 519-535 doi:10.1017/s0016756812000775 | ||
| Plain Text | TREAGUS, JACK E., TREAGUS, SUSAN H., WOODCOCK, NIGEL H. (2013) The significance of the boundary between the Rhoscolyn and New Harbour formations on Holy Island, North Wales, to the deformation history of Anglesey. Geological Magazine, 150 (3) 519-535 doi:10.1017/s0016756812000775 | ||
| In | (2013, May) Geological Magazine Vol. 150 (3) Cambridge University Press (CUP) | ||
| Abstract/Notes | AbstractThe boundary between the Rhoscolyn and New Harbour formations on Holy Island, Anglesey, has been described as a high strain zone or as a thrust. The boundary is here described at four localities, with reference to the contrasting sedimentary and deformational character of the two formations. At one of these localities, Borth Wen, sandstones and conglomerates at the top of the Rhoscolyn Formation are followed, without any break, by tuffs and then mudstones of the New Harbour Formation. It is concluded that there is clear evidence of depositional continuity across the boundary here, and that both formations subsequently shared a common two-phase deformation. The first (D1) was manifestly different in intensity and scale in the two formations, whereas the second (D2) produced very similar structures in both. The other three localities provide continuity of sedimentary and tectonic features at this boundary in a traverse along the length of Holy Island, leading us to identify two previously unrecognized major D1 folds in addition to the Rhoscolyn Anticline. At one of these localities (Holyhead), we confirm the presence of Skolithos just below the boundary, supporting radiometric evidence for a lower Cambrian or later age for the Rhoscolyn Formation. A turbidite interpretation for both the Rhoscolyn and New Harbour formations best fits the available evidence. A deep-water depositional environment is still compatible with the sporadic presence of Skolithos burrows, but less so with reported observations of hummocky and swaley cross-stratification lower down the South Stack Group. | ||
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