Circular 208Latest Pennsylvanian and earliest Permian fusulinid biostratigraphy, Robledo Mountains and adjacent ranges, south-central New Mexico
By Gregory P. Wahlman and William E. King, 2002, 32 pp.
Latest Pennsylvanian and earliest Permian fusulinid foraminifera from the
Robledo, Doña Ana, and southern San Andres Mountains, Doña Ana County, south-central
New Mexico, are described, and their biostratigraphic significance and correlation
are discussed. New collections of fusulinids from the Bursum formation-equivalent
and lower Hueco member contain a few additional species not previously reported
from the area and provide better material for some other previously reported
species. Descriptions of the following species from the new collections
are give: Leptotriticites aff. L. gracilitatus Skinner and
Wilde, L. sp. A., Schwagerina andresensis Thompson, S. sp. A., Pseudofusulina
robleda Thompson, Pseudoschwagerina morsei Needham, P.
cf. P. uddeni (Beede and Knicker), P. texana Dunbar and Skinner,
and P. texana ultima Dunbar and Skinner. The Robledo Mountains contain
one of the most continuous marine carbonate sections through the PennsylvanianPermian
boundary interval in the southwest United States of America, and therefore
it has potential significance as a reference section for correlation of
the new international CarboniferousPermian boundary from Eurasia to
North America. The newly proposed Pennsylvanian-Permian boundary is designated
the Robledo Peak section at the Bursum-Hueco contact, which is placed at
the top of a sandy limestone interval that lies above the occurrences of Leptotriticites hughensis, L. glenensis, L. aff. gracilitatus,
L. sp. A., Pseudofusulina robleda, and Schwagerina grandensis,
and below the basal occurrences of Pseudoschwagerina morsei, P.
taxana, P. texana var. ultima, P. cf. P. uddeni, Schwagerina
andresensis, and Leptotriticites tumida. The stratigraphically
higher fusulinid assemblage correlates well to the faunas of the Neal Ranch
Formation (Nealian) of the Wolfcampian stratotype section in the Glass Mountains
of west Texas.
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