Charles Heaphy, No. 7. Black Boulder Peak. Castle Hill. Coromandel Harbour. [1859]. Ink and watercolour on paper, 320 × 460 mm. LDGSL/209 Geological Society of London. Note: This watercolour was one of seven Heaphy sent to the Geological Society of London together with a manuscript map to illustrate his paper on the Auckland volcanic field in 1859 (Heaphy 1860). The caption text in lower margin [centre:] “Castle Hill”. of {black boulder rock} about 1800 feet high; Coromandel Harbour [left:] Waiau Stream; Gold washings; Hills generally of Porphyritic Breccia with Slate “bars” across the Streams. Quarts viens [sic] frequent. [right:] Rock reported to be Granite. Note the references to Motutere/Castle Rock as both Black Boulder Rock and Black Boulder Peak. The view is east across the Waiau River and up Matawai Stream from [-36.800179 175.527749] towards Castle Rock. Matawai Stream is where alluvial gold was also found and there were later mining attempts. Geologically, the “slate bars” are steeply dipping greywacke basement beds cutting across the stream bed. The text note referring to granite on the right indicates the sketch predates Hochstetter’s visit and influence in June 1859. Compare with the original text on Heaphy’s 1857 map of the area (Fig. 20) and Hochstetter’s subsequent corrections and annotations. Further evidence is the use of the term “breccia” and suggests that the text was modified in 1859 before being submitted to the Geological Society of London.