甘肃临夏盆地椒子沟组上部满散村小哺乳动物群

doi:10.19615/j.cnki.2096-9899.230112

摘要/Abstract

摘要：

记述了中国科学院古脊椎动物与古人类研究所一野外队于2015年在甘肃临夏盆地东乡县满散村附近的椒子沟组上部首次发现的6属10种小哺乳动物化石。其中4个属(Sinolagomys, Litodonomys, Heterosminthus和Yindirtemys)已知最早出现于晚渐新世；两个种(Sinolagomys kansuensis和Heterosminthus lanzhouensis)仅在晚渐新世出现过。该动物群(及其产出地层)的时代很可能为晚渐新世，可称为晚渐新世满散村动物群。该动物群中有一些在牙沟动物群(产于椒子沟组下部)中尚未出现的更晚的属种，并且缺少那些在牙沟动物群中存在的较古老的属种。结合两个动物群的产出层位，满散村动物群的时代要比牙沟动物群晚。如果牙沟动物群的时代为晚渐新世早期，满散村动物群的时代很可能为晚渐新世晚期。这样，椒子沟组可能代表了整个晚渐新世时期的沉积。满散村动物群与亚洲已知的生物带和中国已知的晚渐新世哺乳动物群比较，比我国内蒙古乌兰塔塔尔生物带III和蒙古湖谷地区的生物带C和C1的时代要晚，而与我国西北地区峡沟、塔奔布鲁克、伊克布拉格和铁尔斯哈巴合动物群(或组合)时代相近，比石羌子沟动物群的时代稍晚。

关键词: 甘肃临夏满散村, 晚渐新世, 椒子沟组, 小哺乳动物化石

Abstract:

The micromammal fossils collected from the upper part of the Jiaozigou Formation near Mansancun in 2015 are described. The sample consists of 10 species of six previously known genera (Amphechinus, Sinolagomys, Parasminthus, Litodonomys, Heterosminthus and Yindirtemys) belonging to three orders. Of them, four genera (Sinolagomys, Litodonomys, Heterosminthus and Yindirtemys) made their first appearance in the Late Oligocene and Sinolagomys kansuensis and Heterosminthus lanzhouensis are known only in the Late Oligocene. In comparison with the other Late Oligocene mammalian faunas known in China and Mongolia, the above assemblage appears to be contemporaneous with Xiagou, Taben-buluk, Yikebulage faunas and Tieersihabahe assemblages, but slightly younger than the Shargaltein-Tal Fauna in age. The Mansancun Fauna is also younger than the three Late Oligocene biozones recognized recently in Asia. Compared with the Yagou Fauna collected from the lower part of the Jiaozigou Formation, the Mansancun Local Fauna is clearly younger. Consequently, the Yagou Fauna would be early Late Oligocene, while the Mansancun Local Fauna may be considered late Late Oligocene. Thus, as a whole, the Jiaozigou Formation is Late Oligocene in age.

Key words: Mansancun, Linxia, Gansu, Late Oligocene, Jiaozigou Formation, micromammal fossils

中图分类号:

Q915.873

王伴月, 邱占祥, 王世骐. 甘肃临夏盆地椒子沟组上部满散村小哺乳动物群. 古脊椎动物学报, 2023, 61(2): 123-141.

WANG Ban-Yue, QIU Zhan-Xiang, WANG Shi-Qi. Mansancun Micromammal Fauna from the upper part of the Jiaozigou Formation in Linxia Basin, Gansu Province. Vertebrata Palasiatica, 2023, 61(2): 123-141.

图/表 13

Table 1 Sites yielding micromammals in the upper part of the Jiaozigou Formation in Mansancun, Linxia Basin

Locality	IVPP Loc.	GPS	Altitude (m)
Mansancun, Dongyuan Town, Dongxiang County	LX 201502	N35º36′16.5″; E103º16′53.8″	H2028
	LX 201503	N35º36′16.5″; E103º16′53.33″	H2025
	LX 201507	N35º36′16.4″; E103º16′53.75″	H2001
	LX 201508	N35º36′16.76″; E103º16′53.54″	H2001
	LX 201509	N35º36′16.77″; E103º16′53.94″	H2047

Fig. 1 Geological section near Mansancun, Linxia, Gansu A. photograph of Cenozoic strata near Mansancun, showing the locality and horizon yielding the micromammals (red pentagram) (photo looking northeastward, taken on October 1, 2015 by Wang S Q);B. excavating fossils at the site LX 201502 (photo looking westward, taken on October 3, 2015 by Wang S Q); C. column section of the Cenozoic strata near Mansancun

Fig. 2 Amphechinus and Erinaceinae gen. et sp. indet. from Mansancun, Linxia, Gansu A?B. Amphechinus cf. A. acridens: A. right M1 (IVPP V28334), B. right p2 (V28335); C?E. Amphechinus aff. A. taatsiingolensis: C. left M1 (V28337.1), D. right M2 (V28336.1), E. left m2 (V28336.2);F?G. Erinaceinae gen. et sp. indet.: F. right i3? (V28338.1), G. right c1? (V28338.2), occlusal view

Fig. 3 Sinolagomys kansuensis from Mansancun, Linxia, Gansu, occlusal view A. right P3?M2 (IVPP V28342.2), B. left p3?m2 (V28339.1), C. left P3 (V28339.8), D. left DP4 (V28339.11)

Table 2 Measurements of cheek teeth series of Sinolagomys kansuensis from the Mansancun locality (mm)

Specimens	Length
Specimens	P3‒M2	P3‒M1	P3‒P4	P4‒M2	P4‒M1	M1‒M2
V28342.2	7.40	6.00	4.30	5.00	3.60	2.80
	p3‒m2	p3‒m1	p3‒p4	p4‒m2	p4‒m1	m1‒m2
V28339.1	6.90	5.10	3.30	5.30	3.50	3.60
V28339.2	7.70	5.60	3.60	5.80	3.80	3.80
V28339.3		5.30	3.60		3.40
V28339.4			3.00

Table 3 Measurements of cheek teeth of Sinolagomys kansuensis from the Mansancun locality (mm)

Parameter		N	Range	Average
P3	L	4	1.30‒1.90	1.55
P3	W	3	2.20‒2.90	2.5
DP4	L	1	1.30	1.30
DP4	W	1	2.10	2.10
P4	L	7	1.00‒1.80	1.36
P4	W	7	2.20‒3.20	2.66
M1/2	L	8	0.90‒1.50	1.25
M1/2	W	6	2.00‒2.90	2.45
p3	L	7	1.00‒1.20	1.11
	W (trid)	7	0.80‒1.20	1.01
	W (tad)	7	1.30‒1.50	1.42
	(Wtad/Wtrid)/%	7	1.25‒1.62	1.42
p4	L	4	1.65‒1.80	1.71
	W (trid)	4	1.80‒1.90	1.85
	W (tad)	4	1.30‒1.50	1.39
	(Wtad/Wtrid)/%	4	0.72‒0.79	0.75
m1	L	3	1.60‒1.90	1.73
	W (trid)	3	1.90‒2.10	1.97
	W (tad)	3	1.30‒1.40	1.33
	(Wtad/Wtrid)/%	3	0.62‒0.74	0.68
m2	L	3	1.60‒1.80	1.70
	W (trid)	3	1.80‒2.10	1.93
	W (tad)	3	1.20‒1.30	1.27
	(Wtad/Wtrid)/%	3	0.62‒0.68	0.66

Fig. 4 Parasminthus asiaecentralis from Mansancun, Linxia, Gansu A. left M1 (IVPP V28344), B. right m2 (V28345), occlusal view

Fig. 5 Parasminthus parvulus from Mansancun, Linxia, Gansu A. right P4 (IVPP V28349.6), B. right M1 (V28348.2), C. right M2 (V28349. 24), D. left M3 (V28349.26),E. left m1 (V28349.32), F. left m2 (V28349.42), G. left m3 (V28349.50), occlusal view

Table 4 Measurements of the cheek teeth of Parasminthus parvulus from the Mansancun locality (mm)

Tooth	Length			Width
Tooth	N	Range	Average	N	Range	Average
P4	5	0.45‒0.65	0.54	6	0.50‒0.62	0.53
M1	10	0.95‒1.10	1.02	11	0.85‒0.95	0.91
M2	11	0.85‒1.05	0.95	11	0.82‒1.04	0.90
M3	6	0.50‒0.60	0.57	6	0.65‒0.78	0.70
m1	7	1.00‒1.10	1.05	10	0.70‒0.85	0.78
m2	11	0.95‒1.10	1.01	10	0.80‒0.90	0.84
m3	11	0.70‒0.85	0.77	11	0.60‒0.80	0.71

Fig. 6 Litodonomys sp. from Mansancun, Linxia, Gansu A. left M1?2 (IVPP V28350), B. right M1 (V28351), C. right m2 (V28346), occlusal view

Fig. 7 Heterosminthus lanzhouensis from Mansancun, Linxia, Gansu Occlusal view of left M1 (IVPP V28352)

Fig. 8 Yindirtemys xiningensis and Yindirtemys sp. from Mansancun, Linxia, Gansu A?D. Yindirtemys xiningensis: A. part of left upper jaw (IVPP V28353.1) showing M3 and broken P4?M2,B. left M1/2 (V28353.2), C. right M1/2 (V28354.1), D. right p4 (V28354.2);E. right P4 of Yindirtemys sp. (V28355), occlusal view

Fig. 9 Chronological range of micromammals from the upper part of the Jiaozigou Formation near Mansancun, Linxia Basin

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