Sedimentology and early diagenesis of the Lower Jurassic, Applecross, Wester Ross

Searl, Alison

doi:10.1144/sjg25010045

Cited by 5 publications

(3 citation statements)

References 16 publications

(22 reference statements)

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“…2. Evidence for episodes of emersion and contemporaneous exposure in Applecross was described by Searl (1989). This evidence was questioned by Hesselbo etal.…”

Section: The Diachronous Marine Transgression In Central Skyementioning

confidence: 98%

“…More recent accounts and interpretations of stratigraphy and sedimentary fades are by Hallam (1959), Oates (1976Oates ( , 1978, Searl (1989Searl ( , 1992Searl ( ,1994 and Hesselbo et al (1998), but it is sometimes difficultto reconcile the measured successions of different authors. Searl 1989, andHesselbo et al 1998) 3. Isle of Raasay (Morton &Hudson 1995, Excursion B, especially Locality B3, andHesselbo et al 1998) 4.…”

Section: Stratigraphical Settingmentioning

confidence: 99%

“…Further north, in the outcrops in Applecross, Raasay and Skye, only the Angulata Zone has proof, until now, in the equivalent beds (Hallam 1959, Oates 1978, Hesselbo et al 1998. This led to the interpretation (Morton 1989, Searl 1989) that the Early Jurassic marine transgression did not arrive in this area until the late Hettangian Angulata Zone. This interpretation must now be revised.…”

Section: Introductionmentioning

confidence: 99%

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Middle Hettangian (Lower Jurassic) ammonites from Isle of Raasay, Inner Hebrides, and correlation of the Hettangian-lowermost Sinemurian Breakish Formation in the Skye area, NW Scotland

Morton

1999

SJG

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SynopsisLiasicus Zone (middle Hettangian) ammonites, allocated to a new species, Franziceras sorleyi, are described from Hallaig, Isle of Raasay and indicate that the Breakish Formation / ^v (formerly lower Broadford Beds) there is older than previously thought. The new finds have / ^jIjT \ been integrated with the limited available biostratigraphic information from the rare records I tfT^ /fT% 1 of Hettangian and basal Sinemurian ammonites, and with local lithostratigraphy based I «^S K "H I on marker beds, to develop a new interpretation of correlations within the Skye-I l»sJ' ^J 8 I Raasay-Applecross area. This concludes that there was a diachronous early Jurassic \ ffl J transgression and facies change from the continental red beds of the Stornoway Formation ^s T^ ^s into the marginal marine carbonate-dominated sediments of the Breakish Formation.

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“…2. Evidence for episodes of emersion and contemporaneous exposure in Applecross was described by Searl (1989). This evidence was questioned by Hesselbo etal.…”

Section: The Diachronous Marine Transgression In Central Skyementioning

confidence: 98%

Section: Stratigraphical Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Middle Hettangian (Lower Jurassic) ammonites from Isle of Raasay, Inner Hebrides, and correlation of the Hettangian-lowermost Sinemurian Breakish Formation in the Skye area, NW Scotland

Morton

1999

SJG

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Sedimentology and early diagenesis of the Broadford Beds (Lower Jurassic), Skye, north‐west Scotland

Searl

1992

Geological Journal

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The Broadford Beds comprise a basal carbonate-dominated unit overlain by dark muddy sandstones and an upper cross-bedded sandstone unit. The limestones include coralliferous and oolitic lithologies and the sandstones include pisolitic berthierine ironstones and abundant phosphate nodules. The Broadford Beds have a maximum thickness of 140 m and can be subdivided into 17 parasequences, each initiated by an approximately 20m rise in relative sea level. Marine flooding surfaces are most readily recognized in the lower parts of the succession, where diagenetic data can be utilized to locate emergence surfaces. There is no diagenetic evidence of early emergence in the upper parts of the sequence, but a variety of sedimentological data can be used to identify parasequence boundaries. Deposition of the Broadford Beds occurred largely around the shores of a number of islands in the northern Hebridean area. These islands partly isolated the Skye-Applecross area from a deeper marine basin to the west, and this may have enhanced the formation of authigenic phosphates and iron silicates. It is possible to use the regional variability of parasequence thicknesses to investigate the role of active local tectonism in governing differential subsidence and sediment supply.

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Diagenetic destruction of reservoir potential in shallow marine sandstones of the Broadford Beds (Lower Jurassic), north-west Scotland: depositional versus burial and thermal history controls on porosity destruction

Searl

1994

Marine and Petroleum Geology

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Sedimentology and early diagenesis of the Lower Jurassic, Applecross, Wester Ross

Cited by 5 publications

References 16 publications

Middle Hettangian (Lower Jurassic) ammonites from Isle of Raasay, Inner Hebrides, and correlation of the Hettangian-lowermost Sinemurian Breakish Formation in the Skye area, NW Scotland

Middle Hettangian (Lower Jurassic) ammonites from Isle of Raasay, Inner Hebrides, and correlation of the Hettangian-lowermost Sinemurian Breakish Formation in the Skye area, NW Scotland

Sedimentology and early diagenesis of the Broadford Beds (Lower Jurassic), Skye, north‐west Scotland

Diagenetic destruction of reservoir potential in shallow marine sandstones of the Broadford Beds (Lower Jurassic), north-west Scotland: depositional versus burial and thermal history controls on porosity destruction

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