Figure F7. Normalized percentages of SiO2 and CaO for chert, mixed, and limestone samples. Mixed lithologies are as indicated (see Table T6). XRF = X-ray fluorescence.

Figure F7. Normalized percentages of SiO₂ and CaO for chert, mixed, and limestone samples. Mixed lithologies are as indicated (see Table T6). XRF = X-ray fluorescence.