No, I'm not being impolite - though it is contrary to my nature. Sod kiln, sow kiln, field kiln, scove. Try them for size ...

The irregularities may be due to the thermo-remanent magnetism of a BURIED KILN-so far one Roman-British kiln has been discovered-or to other factors, ...
links.jstor.org/sici?sici=0039-3630(195810)3%3A4%3C195%3AATBOTR%3E2.0.CO%3B2-S

strong magnetic disturbance at ground level in the vicinity of a BURIED KILN was borne out. By means of a magnetic survey the presence of a hitherto unknown ...
antiquity.ac.uk/Ant/032/0268/Ant0320268.pdf

Finding the BURIED KILN on the Broadwood site has advanced our knowledge and understanding of how sow kilns worked. It is known that alternate layers of ...
www.northcravenhistoricalresearch.co.uk/Outreach/IRDP-sows....

Excavation of a Romano-British site near Ingleton, carried out by the Ingleborough Archaeology Group in autumn 2003, revealed a BURIED LIME KILN. Before excavation, this had shown up as a shallow, circular bowl with a narrow entrance on its eastern face. High magnetic readings suggested it could have been an iron-working furnace, though its shape indicated it could equally have been a simple type of lime kiln known as A SOD OR SOW KILN. [ ... ] How did we explain the high magnetic readings from the kiln?
http://www.ydmt.org/docs/1160122077_dalesheritageissue3.pdf

See also "scove kiln", used for brickmaking. Not sure of the relevance of magnetic prospecting to the type of kiln. The above "dales heritage" site suggests magnetic readings would be associated with iron furnaces, whereas your text refers to ceramic/stoneware ...


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Note added at 5 hrs (2007-11-13 00:04:48 GMT)
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Then there are pye kilns, though it appears these and all those I've named were actually for making lime mortar, not ceramics.
http://www.cullercoats-walking-club.org.uk/lime.htm

Appears magnetic remote sensing is used a lot :

Define 50m X 50m areas of interest for Magnetometer survey to look for buried, burned features [...] Because of the high firing temperatures required for pottery production, buried kiln sites should be expressed as very large magnetic anomalies in the high iron content soils present in the area.
http://www.stacemaples.com/downloads/Using ASTER Imagery to ...

Changing tack, however ...

Casson (CARREAUX CASSES); Émaux de verre; Pâte de verre; Carrelage. Mosaique salle de bain: Mosaique salle de bain; Mosaique pate de verre: Mosaique pate de ...
www.cameleon-decoration.com/mosaique.php

Le carreau de céramique (MOSAÏQUE CASSON) La pâte de verre artisanale (mosaïque byzantine) Le grès cérame (mosaïque art-déco) ...
www.sylviepotier.com/Stages_mosaique/stage.htm

Ils seront finalement remplacés par des motifs de roses en CASSON de céramique. ...
fr.wikipedia.org/wiki/Lina_Bo_Bardi

cassons - n.m.pl. [Mat.] DEBRIS DE VERRE OU DE CERAMIQUE. ... Travail du bois • Ferronerie • Brocante • Céramique et Emaux • Mosaïque • Bijouterie • Moulage ...
www.editions-eyrolles.com/Dico-BTP/definition.html?id=7238&...

So I was going down the road "cassons" = "fragments of mosaic" so "cassonnier" = pile of reject ceramics ...

La mosaïque sous toutes ses facettes : cassons,. tesselles de céramique, de pâte de verre, de miroir. Pour renseignements et inscriptions : ...
www.ledomaine.be/les_cours.html

Le terme céramique vient du grec kéramos = argile, terre à potier; mais ce terme ... et celles du tesson (= support) ; LES FRAGMENTS SONT APPELES CASSONS ! ...
webup.univ-perp.fr/lsh/ens/histarts/cours/ceram02.htm

... but then I found "cassons" as some sort of flint-tool-making thingy ...

Il s’agit de six amas de blocs lithiques qui se trouvent dispersés seulement sur une centaine de mètres carrés. Ces structures n’ont été repérées que dans cette partie du site qui présente la plus grosse densité de mobilier. Plusieurs autres objets lithiques (CASSONS, percuteurs dormants…) gravitent autour de ces faits. Plusieurs hypothèses sont envisageables dont celle de foyers pour chauffer et mieux préparer la matière première en vue d’acquérir une réelle amélioration de la qualité des matériaux et donc un meilleur débitage. Le nombre élevé de percuteurs, d’éclats et de nucléus prouve que l’on se trouve sur un site de débitage. Les sites de ce type sont rares en Guyane car difficiles à repérer. L’ABSENCE DE CERAMIQUE, le niveau d’apparition des objets à un mètre sous la surface
www.culture.gouv.fr/culture/actualites/rapports/archeo-prev...

Time for bed. For the moment I'm putting my money on "broken ceramic waste heaps".