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Inverted relative to the sketchbook’s foliation, these very slight sketches (two main views and incoherent details framed by pencil lines at the top right and bottom left) appear to show the inside of Peak Cavern, below Peveril Castle at Castleton, which is seen on adjacent pages. The subject on folio 37 verso (D22219) is positively identified as Peak Cavern by an inscription. Turner’s ‘R’ here may indicate the underground River Styx, or it is possibly a ‘P’ for Peak. For other views of the castle, village and cave, see under folio 1 verso (D22152).