For me, the color version actually has better tonal range than the b/w. The former has no blown out highlight or shadow, but the latter does. I think that a better b/w convsersion with some burning/dodging can enhance the details at both ends of the range.
Not sure if you had tried different compositions during capture. Attached are a couple of cropped variations.
Chris, I hate to tell you this, but you're simply wrong on the tonal issue. I didn't have a colour version of this still in my files (I had parted with my worked up colour copy) so I simply went into Lightroom and clicked on my B&W and switched it back to colour. There are absolutely no tonal changes between the two files. I didn't even adjust the colour channels in creating the B&W.
Moreover, I like some true black and true white in almost all my B&W images. I don't feel there is an absence of shadow details here (or highlight detail).
As for the crops, I can see the merit of loosing a little off the top. However, I think if I re-cropped the top I wouldn't take as much as you have as I feel your crops are beginning to lose the swirling nature of the rock layers in that area.
Thanks for the feedback it is quite constructive.