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deposits. When excavated the matrix may be split along the natural grain or cleavage of the rock. A fossil embedded in the sediment may then also split down the middle, with fossil remains sticking to both surfaces, or the counter slab may simply show a negative impression or mould of the fossil.
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is not preserved. These fossils may be studied while still partially entombed in the sedimentary rock matrix where they are preserved, or once lifted out of the matrix by a peel or transfer technique.
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and other three-dimensional plant structures do not preserve as well under compression. Typically, only the basic outline and surface features are preserved in compression fossils; internal
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In order to increase their profit, fossil hunters and dealers occasionally sell slab and counter slab separately. A reptile fossil also found in
Liaoning was described and named
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A slab and counter slab, more often called a part and counterpart in paleoentomology and paleobotany, are the matching halves of a compression fossil, a fossil-bearing
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sp. nov. (Equisetales) from the
Jurassic San Agustin hot spring deposit, Patagonia: Anatomy, paleoecology, and inferred paleoecophysiology"
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a tale of misguided secrecy and misplaced confidence, of rampant egos clashing, self-aggrandizement, wishful thinking, naïve assumptions,
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to the plane of the deposited sediment. Since leaves are basically flat, the resulting distortion is minimal.
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came into possession of the counter slab through a fossil hunter. On comparing his fossil with images of
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preserved this way. The reason for this is that physical compression of the rock often leads to
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400:"New snakeflies (Insecta: Raphidioptera) from the Lower Cretaceous of the UK, Spain and Brazil"
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234:, a link between dinosaurs and birds, from a 125 million-year-old fossil that had come from
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led to consternation and embarrassment. Lewis Simons investigated the matter on behalf of
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Comparing slab and counter slab has led to the exposure of a number of fossil forgeries.
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Differences between the impressions on slab and counterslab led astronomer
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333:(1st ed.). New York & London: McGraw-Hill Book Company. pp.
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352:(2nd ed.). Cambridge: Cambridge University Press. pp. 7–22.
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preserved as good compression fossils, it is very common to find
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it became evident that it was a composite fake. His note to
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Channing, A.; Zamuner, A.; Edwards, D.; Guido, D. (2011).
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Institute of
Vertebrate Paleontology and Paleoanthropology
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Jepson, J.E.; Ansorge, J.; Jarzembowski, E.A. (2011).
377:. Englewood Cliffs, NJ: Prentice Hall. pp. 7–12.
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102:Compression fossils are formed most commonly in
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254:. In October 2000, he reported what he termed:
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134:may sometimes preserve plant fossils as well.
348:Stewart, Wilson N.; Rothwell, Gar W. (1993).
106:where fine sediment is deposited, such as in
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375:The Biology and Evolution of Fossil Plants
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86:that have been compressed in a direction
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350:Paleobotany and the Evolution of Plants
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270:had been constructed from parts of an
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228:magazine announced the discovery of
238:of China. Chinese palaeontologist
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266:It was eventually determined that
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63:. While it is uncommon to find
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330:An Introduction to Paleobotany
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209:in 1985 to declare that some
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327:Arnold, Chester A. (1947).
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297:. In the same year the
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534:14 September 2012 at
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280:and a small dinosaur
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35:leaves from the Late
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61:physical compression
454:10.3732/ajb.1000211
252:National Geographic
248:National Geographic
225:National Geographic
59:that has undergone
435:Equisetum thermale
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260:human error
207:Lee Spetner
195:sedimentary
181:Longipteryx
130:, although
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203:Fred Hoyle
193:formed in
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118:, and in
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532:Archived
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
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