Oxroad Bay Exposure D, Horizon 6: Tournaisian, United Kingdom
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Oxroadia gracilis multi organs
Alvin 1965
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| section 1.13: axes, leaves, megaspores; section 2.5: axes, megaspores | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United Kingdom | State/province: | Scotland | County: | East Lothian |
| Coordinates: | 56.0° North, 3.0° West (view map) | ||||
| Paleocoordinates: | 10.3° South, 1.7° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | small collection |
Time
| Period: | Carboniferous | Epoch: | Mississippian |
| Stage: | Tournaisian | 10 m.y. bin: | Carboniferous 1 |
| Key time interval: | Tournaisian | ||
| Age range of interval: | 358.9 - 346.7 m.y. ago |
Stratigraphy
| Geological group: | Lower Lothian Calciferous Sandstone Measures (Series) | Formation: | Garlton Hills Volcanics | Member: | Sunnyside/Rhodes Limestone |
| Local section: | Oxroad Bay Exposure D | Local bed: | 6 | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Occurs at the center of the most disrupted strata. Occupies a mini-graben bounded by two parallel SW-NE oriented faults. Sediments produce a pseudochannel. Grading is common.
Scottish Midland Valley | |||||
Lithology and environment
| Primary lithology: | deformed bedding,grading,bioturbation,pyritic,gray siltstone |
| Secondary lithology: | grading sandstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: Horizons vary greatly in degree of texture (siltstones to coarse lapilli tuffs) and degree of induration. In general the coarser and/or more calcareous horizons are more strongly indurated. Grading is common in coarser sections.Grading is common and most evident in the coarser horizons. Upward-fining horizons outnumber upward coarsening horizons, and flame structures occur at the top the coarse lapilli tuff of horizon 2.25. Two horizons near the base of the sequence (1.5 and 1.9) contain abundant in situ pteridosperm roots and can therefore be confidently described as paleosols. Two thick siltstone horizions...contain nodular calcareous concretions. The lower siltstone is a slightly darker grey and richer in pyrite than the upper... | |
| Environment: | lacustrine - large |
| Geology comments: A valuable analogue for these deposits is provided by the thicker, more extensive, and better-know Burdiehouse Limestone Fm...which were deposited in an extensive but shallow meromictic lake (Lake Cadell)...(Loftus 1985; Loftus & Greensmith 1988) | |
Taphonomy
| Modes of preservation: | adpression,permineralized,charcoalification |
| Size of fossils: | macrofossils,mesofossils,microfossils |
| Spatial resolution: | allochthonous |
Collection methods and comments
| Collection methods: | selective quarrying,surface (in situ),mechanical,peel or thin section,field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: 1 blocks collected from section 1.13, 2 blocks collected from section 2.5. | |
| Taxonomic list comments:Specimens collected from two sections within horizon (see comments field). | |
Metadata
| Database number: | 36231 | ||
| Authorizer: | H. Sims | Enterer: | J. Cassara |
| Modifier: | M. Uhen | Research group: | paleobotany |
| Subset of collection #: | 10674 | ||
| Created: | 2004-01-19 15:09:33 | Last modified: | 2018-11-20 09:57:46 |
| Access level: | the public | Released: | 2004-01-19 15:09:33 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 3954. | ETE 234 | R. M. Bateman and G. W. Rothwell. 1990. A reappraisal of the Dinantian floras at Oxroad Bay, East Lothian, Scotland. 1. Floristics and the development of whole-plant concepts. Transactions of the Royal Society of Edinburgh 81:127-159 [H. Sims/J. Allen/H. Sims] |