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In geotechnical terms laminae are just fine scale beds. I've logged core in which the laminae were only visible with a good hand lens and we used the term micro-laminated. The full scale was; very thickly bedded (>2m), thickly bedded(600mm to 2m), medium bedded(200mm to 600mm), thinly bedded(60mm to 200mm), very thinly bedded(20mm to 60mm), thickly laminated(6mm to 20mm), thinly laminated(2mm to 6mm), very thinly laminated(0.6mm to 2mm) and microlaminated(<0.6mm). This extended the standard
BS 5930 (1999) scheme at the thinner end by two divisions. I should probably add something about this.
Mikenorton (
talk)
09:37, 15 July 2008 (UTC)reply
Wow - sorry for not getting back for so long. In geological terminology, a "bed" is colloquially used for everything, but there is an official distinction between bed and lamina at around 2 cm, I believe. But if this doesn't cross into other fields, maybe it's a semantic issue that's not worth pursuing.
Awickert (
talk)
00:40, 2 October 2008 (UTC)reply
References
Boggs, S. Jr., "Principles of sedimentology and stratigraphy 3rd. ed". Prentice-Hall, Upper Saddle River, New Jersey: 726 p.
— The study of beds sequenced as layers on top of other beds.
Campbell C. V., Lamiae, laminaset, bed and bedset: Sedimentology v8, p7-26
— Difference in the sizes of beds and terminology of them.
Einsele G., Ricken W., and Seilacher A., "cycles and events in stratigraphy", Springer-Verlag, Berlin, Heidelberg, New York 1991. 955p.
— Sedimentary's cycle in formation with similar lithology.
Do geologists make a distinction between these three words? The article currently starts by saying "Beds are the layers of sedimentary rocks ... Layers of beds are called strata." Does that make sense? I can't find clear definitions of these words.
UBJ 43X (
talk)
20:53, 23 March 2020 (UTC)reply
Bedding plane
The article uses the term "bedding plane", which is redirected to this article, but never defines it. A definition is badly needed.
Bill (
talk)
19:27, 13 September 2020 (UTC)reply
Bed thickness
The bed thickness descriptions do not match with those in use at least in the UK, EU and Australia - in
BS 5930see page 135 or its equivalents ISO 14689-2017 and AS1726, the boundaries between bedding scales are: