Lake-level changes, sedimentation and faunas in a Middle Devonian basin-margin fish bed

  title={Lake-level changes, sedimentation and faunas in a Middle Devonian basin-margin fish bed},
  author={N. Trewin and R. Davidson},
  journal={Journal of the Geological Society},
  pages={535 - 548}
The classic Devonian fossil fish site at Tynet Burn, Fochabers, NE Scotland has been investigated following recent excavations. The fish assemblage consists of placoderms, acanthodians, an actinopterygian, porolepiforms, osteolepiforms and a dipnoan. The assemblage is typical of the 'Achanarras Fauna' of Eifelian age which is widespread in the Orcadian basin, representing a time of generally high lake levels. The most diverse fauna occurs in the Upper Nodule Bed which can be divided into top… Expand
Recognizing the Kačák Event in the Devonian terrestrial environment and its implications for understanding land–sea interactions
Abstract The Kačák Event is a late Eifelian (Mid-Devonian) episode of marine dysoxia/anoxia with associated extinctions. It has been widely recognized in the shelf seas that surrounded the Old RedExpand
Middle Devonian (Eifelian) spores from a fluvial dominated lake margin in the Orcadian Basin, Scotland
The stratigraphic distribution of Mid Devonian spores is recorded from the Easter Town Burn Siltstone Member. A significant inception within the section is Ancyrospora grandispinosa. This indicatesExpand
Fossil Fish Taphonomy and the Contribution of Microfossils in Documenting Devonian Vertebrate History
Of late little work has been done on Palaeozoic fossil fish taphonomy especially in the Devonian period, [known also as the Age of Fishes], apart from the best-known Lagerstatten. Konservat depositsExpand
Palaeoenvironmental reconstruction of the recent history of Lake Chiuta Wetland, south Malawi
Understanding the environmental trajectory over the recent (ca. 200 years) of shallow inland water bodies is key to sustainable management of the fisheries industry that is facing severe challenges.Expand
Chapter 1 Lacustrine Carbonates
Abstract Lacustrine carbonates accumulate in all climates and in any tectonic situation. Their depositional patterns are assessed through a database involving literature representing over 250 lakesExpand
An investigation of the genus Mesacanthus (Chordata: Acanthodii) from the Orcadian Basin and Midland Valley areas of Northern and Central Scotland using traditional morphometrics
Based upon morphological and morphometric comparisons, this investigation has found that at least two species of Mesacanthus are valid (M. mitchelli and M. pusillus) as specimens from the Lower Devonian and Middle Devonian have been shown to differ significantly in a number of important ways. Expand
Discovery of the arthrodire genus Actinolepis (class Placodermi) in the Middle Devonian of Scotland
Synopsis A single specimen of the placoderm Actinolepis found in the Middle Devonian (Eifelian) Achanarras fish bed of Achanarras Quarry, Caithness, is the first record of the genus in the DevonianExpand
Preservation of Devonian chemotrophic filamentous bacteria in calcite veins
Filamentous and possible coccoid bacteria are preserved in calcite vein-fills cutting Devonian lacustrine limestones in the Tynet Burn fish bed near Fochabers, N.E. Scotland. Filamentous bacteriaExpand
Unusual preservation of the internal organs of acanthodian and actinopterygian fish in the Middle Devonian of Scotland
Synopsis Relics of internal organs identified as kidney, liver and heart, and also eyes of acanthodian and actinopterygian fishes, have been found in specimens from the Middle Devonian nodule bedExpand
The diplacanthid fishes (Acanthodii, Diplacanthiformes, Diplacanthidae) from the Middle Devonian of Scotlan
The Diplacanthiformes are a clade of acanthodian fishes which were widespread during the Middle and early Late Devonian. They are best represented in the Middle Devonian, by articulated fossils, finExpand


Devonian lacustrine limestones at the margin of the Orcadian Basin, Scotland
  • R. Donovan
  • Geology
  • Journal of the Geological Society
  • 1975
A complex overlap of middle Old Red Sandstone occus in N. Caithness and Sutherland. The relief of the underlying surface of Moine metamorphics and intrusions is irregular. The facies variation of theExpand
Palaeoecology and sedimentology of the Achanarras fish bed of the Middle Old Red Sandstone, Scotland
The Achanarras fish bed of Middle Devonian age in the Orcadian Basin was deposited in a large freshwater lake of variable productivity in which thermal stratification was normally developed. The fishExpand
Environmental Controls on Fish Faunas of the Middle Devonian Orcadian Basin
Abstract The prolific fish faunas of the Middle Old Red Sandstone in the Orcadian Basin in northeastern Scotland are preserved in lacustrine laminites, deposited during deep-lake phases of aExpand
Lacustrine cycles, fish ecology and stratigraphic zonation in the Middle Devonian of Caithness
Synopsis Lacustrine Middle Devonian (Old Red Sandstone) sediments show climatically-controlled cycles resulting from the long-term rise and fall of lake levels in an enclosed basin. LithologiesExpand
The Devonian lacustrine sediments of Orkney, Scotland; implications for climate cyclicity, basin structure and maturation history
  • T. Astin
  • Geology
  • Journal of the Geological Society
  • 1990
The Orcadian Basin of northern Scotland (largely of Middle Devonian age) is a major lacustrine rift basin, with the widely correlateable, Achanarras/Sandwick lake bed extending for at least 800 kmExpand
Carbonate production within the orcadian basin, northern Scotland: A petrographic and geochemical study
A number of primary phases and textures are described for the Debonian lacustrine carbonates of the Orcadian Basin. Textural and mineralogical variations record changes in the original lake waterExpand
Correlation of the Achanarras and Sandwick Fish Beds, Middle Old Red Sandstone, Scotland
  • N. Trewin
  • Geology
  • Scottish Journal of Geology
  • 1976
The Achanarras Fish Bed of the Middle Old Red Sandstone of Caithness, separating the Lower and Upper Caithness Flagstone Groups of Donovan, Foster and Westoll (1974), has long been correlated withExpand
Milankovitch cyclicity recorded from Devonian non-marine sediments
Hydrographically closed basins are sensitive to environmental change at all scales, the influence of climate being particularly strong. Some Devonian basins contain non-marine successions whichExpand
Middle Devonian Osteolepid Fishes of Scotland
FOR more than, a century, since the days of the pioneer workers on the Old Red Sandstone, the osteolepid fishes have proved a source of difficulty to vertebrate palæontologists, and even more so toExpand
On the Relations of the different parts of the Old Red Sandstone in which Organic Remains have recently been discovered, in the Counties of Moray, Nairn, Banff, and Inverness
  • J. Malcolmson
  • Geology
  • Quarterly Journal of the Geological Society of London
  • 1859
Conclusion From the facts above detailed, we may conclude— 1st. That the primary stratified rocks of the southern shores of the Moray Frith were elevated at very considerable angles previously to theExpand