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A slab and counter slab, more often called a part and counterpart in paleoentomology<ref name="Jepson2011">{{cite journal |last1=Jepson |first1=J.E. |last2=Ansorge |first2=J. |last3=Jarzembowski |first3=E.A. |year=2011 |title=New snakeflies (Insecta: Raphidioptera) from the Lower Cretaceous of the UK, Spain and Brazil |journal= Palaeontology |volume=54 |issue=2 |pages=385–395 |doi=10.1111/j.1475-4983.2011.01038.x}}</ref> and paleobotany,<ref name="Channing2011">{{cite journal |last1=Channing |first1=A. |last2=Zamuner |first2=A. |last3=Edwards |first3=D. |last4=Guido |first4=D. |year=2011 |title=''Equisetum thermale'' sp. nov. (Equisetales) from the Jurassic San Agustin hot spring deposit, Patagonia: Anatomy, paleoecology, and inferred paleoecophysiology. |journal= American Journal of Botany |volume=98 |issue=4 |pages=680–697 |doi= 10.3732/ajb.1000211 |pmid=21613167}}</ref> are the matching halves of a compression fossil, a fossil-bearing [[Matrix (geology)|matrix]] formed in [[sedimentary]] 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.<ref>[http://www.proz.com/kudoz/english_to_polish/archaeology/762880-slab_counter_slab.html ProZ]</ref> Comparing slab and counter slab has led to the exposure of a number of fossil forgeries.
Differences between the impressions on slab and counterslab led astronomer [[Fred Hoyle]] and applied physicist [[Lee Spetner]] in 1985 to declare that some ''[[Archaeopteryx]]'' fossils had been [[Archaeopteryx#Controversy|forged]], a claim dismissed by most palaeontologists.<ref>[https://books.google.com/books?id=gWtV-9zG8ycC&pg=PA3&lpg=PA3&dq=fossil+%22Counter+slab%22&source=bl&ots=CA29NkZFrV&sig=3fBfq4s4V6-8EgE0Fs257BMoFDg&hl=en&ei=bd81TI6YN9PFsgaytY3OAQ&sa=X&oi=book_result&ct=result&resnum=9&ved=0CEAQ6AEwCA#v=onepage&q=fossil%20%22Counter%20slab%22&f=false ''New Scientist'' 14 March 1985]</ref>
In its November 1999 edition, ''[[National Geographic Magazine|National Geographic]]'' magazine announced the discovery of ''[[Archaeoraptor]]'', a link between dinosaurs and birds, from a 125 million
It was eventually determined that ''Archaeoraptor'' had been constructed from parts of an [[Early Cretaceous]] bird ''[[Yanornis martini]]'' and a small dinosaur ''[[Microraptor zhaoianus]]''<ref>[http://www.ifs.csic.es/sorites/Issue_20/colbourn.htm The Interpretive Mind] {{webarchive|url=https://web.archive.org/web/20100401195602/http://www.ifs.csic.es/sorites/Issue_20/colbourn.htm |date=
In order to increase their profit, fossil hunters and dealers occasionally sell slab and counter slab separately. A reptile fossil also found in Liaoning
==References==
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