The Silurian Succession at Gorsley (Herefordshire)

Lawson, J. D.

doi:10.1017/s0016756800065183

Cited by 26 publications

(15 citation statements)

References 4 publications

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“…Here the oldest strata exposed are several metres of hard limestone, overlain by 4 m of calcareous shale with phosphatic nodule horizons. Lawson (1954) correlated the limestone with the Wenlock Limestone and the overlying shales he interpreted as an attenuated Ludlow succession. The lack of a change from onshore to.…”

Section: (B) the High Lower Elton Beds And Lowmentioning

confidence: 97%

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The diachronism of the Wenlock Limestone

Hurst

1975

LET

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A quick transgressive event occurs near the top of the Wenlock Limestone. The initiation of this is thought to be synchronous, proving the top of the Wenlock Limestone to be diachronous and younging southwards. As a result the top of this rock unit cannot be used satisfactorily as a time line. It is suggested that the initiation of the transgression be taken as the practical means for the correlation of the Wenlock‐Ludlow Series boundary. The Birmingham Siltstone Formation is erected for the strata between Dudley and Ludlow which are younger than Wenlock Limestone and older than the transgression. The Wenlock Limestone of Usk was deposited after the transgression and is unrelated to the main Wenlock Limestone. Thus it is treated as a separate entity and named here the Usk Limestone Formation.

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Section: (B) the High Lower Elton Beds And Lowmentioning

confidence: 97%

“…offshore shelf conditions may be due to the fact that the district was an area of non-deposition or erosion. Lawson (1954) attributes the thin Ludlow sequence to movement at various times along an axis passing through Gorsley. These movements may have been operative at the time of the deepening.…”

Section: (B) the High Lower Elton Beds And Lowmentioning

confidence: 99%

The diachronism of the Wenlock Limestone

Hurst

1975

LET

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“…In addition, Ball (1951) gave an account of these beds in Staffordshire ; Banks (1859) and Kirk (1951) in the Kington area ; Phillips (1848), and Lawson (1954Lawson ( , 1955 in the area west of the Malvern and Abberley Hills ; Squirrell (1958) and Squirrell and Tucker (1960) in the Woolhope district, and Walmsley (1959) around Usk. In the Welsh Borderland east of the Church Stretton axis, the Ludlow Series consists of a succession which coarsens upwards.…”

Section: Ludlow Seriesmentioning

confidence: 99%

The Downtonian and Dittonian Facies of the Welsh Borderland

Allen

Tarlo

1963

Geol. Mag.

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The succession of Lower Old Red Sandstone rocks found in the Welsh Borderland, is reinterpreted to reveal a shifting pattern of facies of far greater complexity than was hitherto realized. The sequence of vertebrate faunas is examined in conjunction with the sediments, and in this way a fuller account is given of the conditions of life of these early vertebrates, than was previously possible. The boundary between the Downtonian and Dittonian Stages is revised to coincide with the major palaeontological break in the region, and this is shown to approximate to a major lithological break, which is here accepted as the division between the local rock units known as the Downton and Ditton Series.

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“…South of the Malverns, the Aymestry Limestone is missing and the basal LLB conglomerates are thicker, coarser and more numerous. At Gorsley, 1.5 m of LLB siltstones rest on an eroded surface of the Gorsley Limestone, which Lawson (1954) correlated not with the Aymestry Limestone but with the Wenlock Limestone. Such a correlation implies a large break in the succession.…”

Section: A Stratigraphical Occurrencementioning

confidence: 93%

Hardgrounds in the Lower Leintwardine Beds (Silurian) of the Welsh Borderland

Cherns

1980

Geol. Mag.

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SummaryThe base of the Lower Leintwardine Beds (Silurian-Ludlow Series) in the shelf sequences of the Welsh Borderland is marked by a widespread development of shelly conglomeratic limestone beds. Borings into some intraclasts indicate that they were hardgrounds. The early lithification, sometimes in situ, of both sand-grade and mud-grade carbonates is demonstrated by the conglomerates. Some compound intraclasts (‘hiatus concretions’) indicate a complex history of deposition, scouring and lithification. Boring of clasts which have not been further eroded is inferred to have taken place locally. The borings are of the narrow, single entrance form referable to Trypanites. The distribution of the conglomerates relates closely to Leintwardinian palaeogeography. Repeated hardground formation in sequences of inner shelf areas reflects episodic deposition alternating with periods of omission and erosion. There is evidence throughout the shelf of a break in sedimentation with hardground formation at the end of Bringewoodian times. The nature of the conglomerates suggests that they formed in shallow water conditions; there is no lithological indication of sub-aerial exposure. The absence of the Aymestry Limestone in the SE shelf is more probably due to its non-deposition or lateral lithological change to muddier beds with a different faunal assemblage than to its subsequent removal by erosion.

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The Silurian Succession at Gorsley (Herefordshire)

Cited by 26 publications

References 4 publications

The diachronism of the Wenlock Limestone

The diachronism of the Wenlock Limestone

The Downtonian and Dittonian Facies of the Welsh Borderland

Hardgrounds in the Lower Leintwardine Beds (Silurian) of the Welsh Borderland

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