At Sites 47 and 48, impenetrable and cherty Upper Cretaceous chalks were found. The upper part of what infer to be lower Cretaceous is even more reflective, and likely to be very cherty (and was found
Method A: wet-bulk volume measured with special volume sampler; method B: wet-bulk volume measured by gas pycnometry; method C: dry volume measured by gas pycnometry
