The microscopic clutching / crushing teeth of Batomorphs (living rays and skates) are recovered from the residues of bulk sampled material, from phosphate-rich sections at various levels in the Chalk. 

Tooth form is variable, but in general the crown is low to flattened, forming a broad crushing surface, or with a broad, squat and strongly lingually inclined main cusp (sub-horizontal).  The root is low, constricted below the crown, with a wide flat base bearing a deep groove-like basal notch.

Rajiformes are generally rare parts of the microfauna, making up only a few percent of the total teeth.  Despite this they are diverse and numerous genera (some unnamed) are present.  Sclerorhynchids (sawfishes) are extremely rare in the British Chalk and restricted to small species, unlike in some warm water Cretaceous deposits (such as in Texas and Morocco) where they are common and contain large species.

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1).  Squatirhina thiesi - representative isolated microscopic Rajiform tooth from the Albian Gault Clay of Folkestone, David ward Collection (x 23): (A) Oral View; (B) Lateral view.   Images by kind permission of David Ward.  See also www.gaultammonite.co.uk [Fossils of the Gault Clay]. 
 

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2).  Squatirhina thiesi - representative isolated microscopic Rajiform tooth from the Albian Gault Clay of Folkestone, David Ward Collection (x 35): (A) Oral View; (B) Basal view.   Images by kind permission of David Ward.  See also www.gaultammonite.co.uk [Fossils of the Gault Clay]. 
 

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3).  Modern Guitarfish for illustration - Rhinobatus productus ('Shovelnose Guitarfish'): (A) Imaged sourced from Flickr.com; (B) Image sourced from Mongabay.com.