Second-day road log, from Lordsburg to Deming via Little Hatchet Mountains and Victorio Mountains
— T. F. Lawton, N. J. McMillan, V. T. McLemore, and J. W. Hawley

Summary:

The route for Day 2 makes a circuit of the Little Hatchet Mountains and a stop at the mining district of the Victoria Mountains. The Little Hatchet Mountains contain the most complete Upper Jurassic to Lower Cretaceous and Laramide sections in southern New Mexico. Laramide structural features are also well displayed in the range. In the southern end of the range, basement plutonic rocks of Proterozoic or Cambrian age are thrust over Upper Paleozoic strata deposited in the Pedregosa basin. The first stop of the day provides an overview of the Laramide structure and Mesozoic stratigraphy, as well as Neogene and Quaternary basin development, Basin-and-Range structure, and ground-water systems of the Hachita Valley. The second stop is a hike through the upper part of a Late Jurassic fan-delta and volcanic succession in the Broken Jug Formation. Laramide strain fabrics are well exposed, as are Jurassic(?) and Tertiary intrusive relationships and faulting. The route then traverses the range, crossing important Laramide folds and reverse faults, passes south along the west side of the mountains, and stops near Granite Pass at a major reverse fault and skarn deposit at the junction of Proterozoic or Cambrian granite, upper Paleozoic carbonate rocks, and Tertiary granite. A final, optional stop in the Victorio Mountains provides a view of Laramide structure and carbonate-hosted replacement mineral deposits in lower Paleozoic rocks.


Full-text (4.30 MB PDF)


Recommended Citation:

  1. Lawton, T. F.; McMillan, N. J.; McLemore, V. T.; Hawley, J. W., 2000, Second-day road log, from Lordsburg to Deming via Little Hatchet Mountains and Victorio Mountains, in: Southwest passage. A trip through the Phanerozoic, Lawton, Timothy F.; McMillan, Nancy J.; McLemore, Virginia T., New Mexico Geological Society, Guidebook, 51st Field Conference, pp. 17-30. https://doi.org/10.56577/FFC-51.17

[see guidebook]