Cajon Pass Scientific Drilling Questions? See our Frequently Asked Questions. Holes Cajon Pass 1-26 Cajon Pass 2-26 Tools Aluminum Clay Tool (act) Borehole Compensated Sonic Tool (bhc) Caliper Log (caliper) Compensated Density Log (cdl) Compensated Neutron Tool (cntg) Dual Induction Log (dil) Dual Laterolog (dll) Induced Gamma Ray Spectrometry Tool (gst) Lithodensity Tool (ldt) Natural Gamma Ray Spectrometry Tool (ngt) Natural Gamma Ray Tool (gr) Sonic Digital Tool (sdt) (re-sort tools by acronym) Measurements acoustic waveforms borehole diameter depth match density geochemistry gamma ray porosity resistivity velocity (Vp and Vs) velocity (Vp) Hit Clear to reset parameters between separate queries