Pg. 46 (table 1), 50-51. Hondo Group. Replaces invalid Ortega Group of Long, 1976 (New Mexico Bur. Mines Min. Res. Open-file Rpt., no. 71, 557 p.). Includes (descending) Piedra Lumbre, Pilar, Rinconada, and Ortega formations. Overlies Vadito Group. A regionally extensive 1 to 100 m-thick manganiferous marker layer occurs near the contact. Age is considered Early Proterozoic, younger than 1,700 Ma.
Principal reference section (group and constituent formations): Hondo Canyon area, in secs. 29 and 32, T. 24 N., R. 12 E., Taos SW 7.5-min quadrangle, Taos Co., northern Picuris Mountains, [Carson National Forest area], central northern NM.

Source: Publication.

Pg. 1424-1425, 1427, 1429 (fig. 5), 1430-1431, 1432; C.G. Daniel and others, 2013, GSA Field Guide 33, p. 205-235. Hondo Group. Includes (descending) Piedra Lumbre Formation, Pilar Formation, Rinconada Formation, and Ortega Formation; [on p. 1429 (fig. 5), and p. 1432-1433, authors included the Piedra Lumbre and Pilar in their informal Trampas group]. Age of Piedra Lumbre and Pilar Formations, in upper part of Hondo Group, changed from Paleoproterozoic --to-- Mesoproterozoic based on new isotopic data. New detrital zircon ages indicate deposition of Piedra Lumbre sediments occurred between ca. 1,490 Ma and 1,450 Ma, and a metamorphosed tuff layer in upper part of the Pilar is 1,488 +/-6 Ma.

Source: Publication.