felsic tuff

My 1st time on this forum I think.

In the 16/4 QAR for RNI, Figure 2 is a diagram of its Callies prospect - just recently drilled and most assays being in and published in the QAR.

The mustard coloured line down the left side and also partly on the right is described as a felsic crystal tuff. This whole area is described by the CP as "Fortnum Wedge".

Having regard to the assays in Appendix 2 perhaps, I'd like some geo input as to the significance, if any, of the tuff being on both the east and west sides.

Also, is the existence of the tuff a guide to something beneath? The holes have been drilled in and near the western tuff. They would have been targeted.

Also, what is a wedge?

Thanks, in anticipation.