Late Cenozoic Yushe Basin, Shanxi Province, China: Geology and Fossil Mammals by Lawrence J. Flynn & Wen-Yu Wu

Author:Lawrence J. Flynn & Wen-Yu Wu
Language: eng
Format: epub
Publisher: Springer Netherlands, Dordrecht

M1

M3

m1–3

m1

m2

m3

N

3

1

2

5

4

5

L

Range

3.6–4.0

9.9–10.3

3.6–4.5

3.0–3.6

2.5–2.8

Mean

3.82

2.53

10.1

4.16

3.25

2.6

N

3

2

5

4

5

W

Range

2.6–2.75

2.1–2.15

2.4–2.9

2.6–3.1

2.1–2.3

Mean

2.68

2.13

2.66

2.85

2.18

Stratigraphic range: Culiugou Member, Gaozhuang Formation, to lower Mazegou Formation, 4.3 to 3.4 Ma.

Description: Anterior wall of M1 projects very slightly or is flat. Both the first lingual and buccal reentrants penetrate the crown slightly deeper than the second lingual and buccal reentrants (Fig. 9.9a). Dentine tract of the first lingual salient angle is relatively low with an A′ value of 2.1. Anterior and posterior enamel terminates at the level of the base of the LRA1 reentrant. Buccally, the dentine continues up the salient angles to reach the occlusal surface, although mesially the enamel terminates at the base of the first reentrant (BRA1) and distally the enamel terminates at the base of the second reentrant (BRA2, Fig. 9.9a1).

Fig. 9.9Dental morphology of Mesosiphneus praetingi, 1 mm scale. a–d: Occlusal view, a1 and c2: buccal view, b1 and c1: lingual view, a–a1: left M1 (V11171.1), b–b1: left m1-2 (V11172.2), c–c2: right M3 (V11172.2), d: left m1–3 (V11171.4)

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