unrestricted use, copyright acknowledgement
Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced British Geological Survey materials "Contains British Geological Survey materials ©UKRI [year]"
Dual Sparker/Watergun/Airgun record. Separate Sparker and Watergun physical records also exist. Data gap fix 54.4-60. Fix 1-54 on the Watergun half are Watergun. Fix 61-68 on the Watergun half are Airgun.