Marl occurs in two dry lake beds in the valley of Roany Creek, 2.5 to 3.2 kilometres southeast of Granite Creek, 11 kilometres west-northwest of Princeton.

The two lake beds are 213 and 488 metres in length respectively, with a separation of approximately 520 metres. Marl occupies the top 1.8 to 2.8 metres of the lake beds. The marl grades rapidly downward into yellowish clay, sometimes accompanied by up to 0.3 metre of sandy material at or near the contact.

The marl is pale coloured and granular, with abundant small shells and shell fragments. In the eastern lake bed it is moist and saturated in the lower 0.3 to 0.6 metre, just above the clay layer, while in the western lake bed the material tends to be drier. The marl is contaminated by boulders and talus material near the margins of the lake beds. Four samples collected by auger drilling analyzed as follows (in per cent) (M.S. Hedley, 1945, page 5):

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     Sample     Depth       CaO     CaCO3      MgO
                 (m)
      414H      0-2.8      50.2      89.6      0.7
      415H      0-1.8      49.6      88.5      0.6
      416H      0-1.5      47.0      83.9      0.8
      418H      0-2.9      46.4      82.8      0.9
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The eastern lake bed contains 17,000 tonnes of marl over a 183 by 37 metre area down to an average depth of 2.0 metres, while the western lake bed contains 32,100 tonnes of marl over 9671 square metres down to an average depth of 2.6 metres (Industrial Mineral File - Hodley, 1945, page 3).

This marl was mined by various operators for agricultural markets in the Fraser Valley between 1946 and 1948. A total of 1113 tonnes was produced.