. Bulletin. Science; Natural history; Natural history. Figs. 1-2. Teeth of Tamias cf. T. merriami from Rancho La Brea. Fig. 1, right M', LACMRLP 52223, occlusal view. Fig. 2, right Mj, LACMRLP 52229, occlusal view. Scale line equals 2 mm. LACM 6909 has been cleaned (field numbers GJM 273, 275, 295, 480, 537, 539, and 550). This matrix was from grid designations N-3 and M-3 from a depth between 5 feet and feet below datum (see Shaw 1982, for a detailed explanation of the grid and sub-locality designations). The fossils occur in fine grained silty asphaltic sandstone with lenses of brown sil
. Bulletin. Science; Natural history; Natural history. Figs. 1-2. Teeth of Tamias cf. T. merriami from Rancho La Brea. Fig. 1, right M', LACMRLP 52223, occlusal view. Fig. 2, right Mj, LACMRLP 52229, occlusal view. Scale line equals 2 mm. LACM 6909 has been cleaned (field numbers GJM 273, 275, 295, 480, 537, 539, and 550). This matrix was from grid designations N-3 and M-3 from a depth between 5 feet and feet below datum (see Shaw 1982, for a detailed explanation of the grid and sub-locality designations). The fossils occur in fine grained silty asphaltic sandstone with lenses of brown silt, sediments that represent an infilling of an older stream channel. These stream sediments have yielded a radiometric date using '"^C of 32,600 ± 2800 years before present based on one specimen of a juvenile Smilodon left femur from this concentration (specimen number R-51285, from locality GJM 550, grid M-3 at feet below datum; UCLA 1738-D; Marcus and Berger 1984). The small fossils recovered from this northeast deposit contain a diverse as- semblage of snails, lizards, snakes, and small mammals, including nine isolated chipmunk teeth that are described below. Dental terminology and measurements follow Black (1963). Measurements are made on an EPOI Shopscope optical micrometer. Taxonomy for chipmunks follows Levenson et al. 1985. Family Sciuridae Gray, 1821 Subfamily Sciurinae Baird, 1857 Tamias c^. T. merriami (Allen, 1889) Figs. 1 and 2, Table 1 Material. —{SpecimQn numbers prefixed LACMRLP) Right M' (52223) from locality GJM 273; left P'* (52226), right dP4 (52225), left P4 (52227), right M, (52224) from locality GJM 539; right M' (52230), left M^ (52231), right P4 (52228), right M, (52229) from locality GJM 550. Description.—Teeth with tall lophs(ids); upper molars subquadrate in outline, protoconule and metaconule absent, metaloph only slightly constricted at con- nection to protocone, anterior cingulum well developed but lacking distinct para- style, mes
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