BH-3. Unravelling an allochthonous, subaqueously deposited volcanic–epiclastic to subaerial andesitic lava assemblage in Hong Kong: age, stratigraphy and provenance studies of the Middle Jurassic Tuen Mun Formation SewellR. J. SoK. W. F. TangD. L. K. CarterA. 2017 BH-3 drillhole record