Page 103 - Land Snails of New Mexico

Table6.RecordsofQuaternaryfossilandlivinglandsnailsfromtheHatchetMountainsarea,southwesternNewMexico. Underthe heading "U-Bar Cave Mt." are shown total numbers of fossils recovered from sediments in U-Bar Cave by A. H. Harris and living speciestakenintalusatalocalityca.2milesnorthofU-BarCaveonthenorthsideofthesamemountain. Undertheheading"Big Hatchet Mts." are listed species taken as fossils in colluvium on the east side of Big Hatchet Mountain, and living species reported by Pilsbry(1915)andcollectedbySmarttandMetcalfinthe1980s. Undertheheading"HowellsRidge"(locatedintheLittleHatchet Mountains), are listed species of fossils taken from slope colluvium and from Howells Ridge Cave and living species collected on Howells Ridge.
Species
Cionella lubrica Pupilla sonorana Gastrocopta pilsbryana Gastrocopta ashmuni Gastrocopta pellucida
Valloniaperspectiva Vallonia sonorana Holospira crossei
Holospira metcalfi Rabdotus durangoanus Helicodiscus singleyanus Radiocentrum ferrissi Radiocentrum hachetanum
Fossil
1 0 2 7 2
4 0
1 3 2 1 6 7
Living
X X
X
Fossil
Living
Fossil Living
Succineidae
Glyphyalinia indentata
Hawaiia minuscula Ashmunellamearnsii 60 Ashmunella hebardi Thysanophorahornii
Sonorella hachitana
Northern N e w Mexico
X X
X X X
As demonstratedabove,montanesitesyieldingQuaternary fossil land snails are relatively widespread in southern N e w Mexico. However, some montane and some cave deposits in the northern part of the state also have yielded such fossils. In the earliest1900s,T.D.A.andWilmatePorterCockerellcollected fossilshellsalongPecosCanyon northofthevillageofPecoson the Valley Ranch (=Alexander Vallé Grant). From these beds, Cockerell (1903) described Ashmunella thomsoniana pecosensis and (1905) Oreohelix yavapai compactula and reported(1903)Oreohelixstrigosaand Valloniacyclophorella. IhavecollectedthefollowingspeciesincutsalongNew Mexico Highway 63, opposite the entrance to the Benedictine Monastery,ca.0.8km (0.5mi)northofthePecosRiverBridge on the Vallé Grant: Pupilla sp., Vallonia cyclophorella, Discus whitneyi, Euconulus fulvus, Glyphyalinia indentata, Zonitoides arboreus, Ashmunella thomsoniana and Oreohelix strigosa depressa. In Gallinas Canyon, San Miguel Co., Pleistocene sedimentsexposedinroadcutsalongNew MexicoHighway65
Cionellalubrica (5)
Pupoidesalbilabris (20) Gastrocoptaarmifera (8) Gastrocoptacristata (9) Gastrocoptapellucida (1) Valloniaparvula (10) Zonitoides arboreus (3)
Walloniagracilicosta (2)
Valloniacyclophorella (3) Oreohelixstrigosadepressa(2) Succineids (8) Euconulusfulvus (2) Nesovitrea hammonis (1)
U-Bar Cave Mt.
BigHatchetMts. HowellsRidge
4 7 1
1
1450
X
X X X
X
X X
X X X X X
X X
X X X X
X
X
X
X X
betweenMontezumaandElPorvenirhaveyieldedthefollowing
species (number of localities indicated in parentheses): Pupilla blandi(1),Pupillamuscorum (1),Valloniacyclophorella(3), Vallonia gracilicosta (1), Discus shimekii (3), succineids (1),
Hawaiia minuscula (1), Ashmunella thomsoniana (3), and
Oreohelix neomexicana (3). TheNacimientoMountainsinSandovalCo.haveareasof
calcareous bedrock. Colluvial and alluvial deposits in this range have provided specimens of several species. Alluvial deposits along the Rio Guadalupe Canyon 1 k m (0.62 mi) north of Gilman, Sandoval Co.,yielded the following species (number of specimens indicated in parentheses):
X
X
X
X
X X X
The "Gilman" fauna comprises a mixture of species not
X X
97