Santa Isabel Iztapan: Late/Upper Pleistocene, Mexico
collected by L. Avelayra, M. Maldonado-Koerdell, A. Romano 1950, 1952

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Proboscidea - Elephantidae
Mammuthus (Archidiskodon) imperator (Leidy 1858)
synonym of Mammuthus columbi
Gastropoda - Hydrobiidae
Paludestrina sp. d'Orbigny 1839
Gastropoda - Heterostropha - Planorbidae
Helisoma sp. Swainson 1940
Gastropoda - Heterostropha - Physidae
Physa sp. Draparnaud 1801
Gastropoda - Heterostropha - Succineidae
Succinea sp. Draparnaud 1801
unclassified
Limnaea sp. Lamarck 1799
see common names

Geography
Country:Mexico State/province:Mexico
Coordinates: 19.6° North, 99.7° West (view map)
Paleocoordinates:19.6° North, 99.7° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period:Quaternary Epoch:Pleistocene
Stage:Late/Upper Pleistocene 10 m.y. bin:Cenozoic 6
Key time interval:Late/Upper Pleistocene
Age range of interval:0.12900 - 0.01170 m.y. ago
Stratigraphy
Stratigraphic resolution:bed
Stratigraphy comments: in a "65 cm" thick bed "indisputably within a Pleistocene level equivalent to the lower part of the Upper Becerra formation"
Lithology and environment
Primary lithology:fine,shelly/skeletal,green poorly lithified argillaceous sandstone
Lithology description: entirely from "A sandy material, fine grained, with a pale greenish color, mixed with some amount of clay and - near the bottom of the excavation - with material of bentonitic aspect and numerous gastropods" also called "the 'green muck' (limo verde)" clearly poorly lithified based on photos
Environment:lacustrine indet.
Glacial or sequence phase:late glacial
Geology comments: a "lake"
Taphonomy
Modes of preservation:body,anthropogenic
Size of fossils:macrofossils
Temporal resolution:snapshot
Spatial resolution:autochthonous
Collection methods and comments
Collection methods:salvage,selective quarrying,field collection
Reason for describing collection:archaeological analysis
Collectors:L. Avelayra, M. Maldonado-Koerdell, A. Romano Collection dates:1950, 1952
Collection method comments: apparently reposited in the Instituto Nacional de Antropologia e Historia
discovered by "workers opening an irrigation ditch" in 1950 and excavated by the authors in 1952
Metadata
Database number:93639
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Alroy Research group:vertebrate
Created:2010-01-26 17:14:06 Last modified:2010-01-28 17:38:14
Access level:the public Released:2010-01-26 17:14:06
Creative Commons license:CC BY
Reference information

Primary reference:
24034. L. Aveleyra Arroyo de Anda and M. Maldonado-Koerdell. 1953. Association of artifacts with mammoth in the Valley of Mexico. American Antiquity 18(4):332-340 [J. Alroy/J. Alroy/J. Alroy]