Table 1 Summary of mesowear and isotopic values of Micromeryx from the ACM sequence according to morphotypes and environmental phases

Morphotypes

# M

pS

pR

pH

MS

#C

δ¹³C

SD δ¹³C

δ¹⁸O_CO3

SD δ¹⁸O_CO3

SD δ¹⁸O_PO4

Δ δ¹⁸O_CO3-δ¹⁸O_PO4

 Morphotype 1

8

69.2

30.8

100

0.31

8

− 10.5

0.7

27.9

1.0

1.4

8.4

 Morphotype 2

24

80.6

19.4

100

0.19

21

− 11.8

0.8

27.7

1.5

1.9

8.7

 Morphotype 3

11

86.7

13.3

95

0.21

6

− 11.0

1.2

27.0

0.6

1.1

8.3

Environmental phases

#M

pS

pR

pH

MS

#C

δ¹³C

SD δ¹³C

δ¹⁸O_CO3

SD δ¹⁸O_CO3

#P

δ¹⁸O_PO4

SD δ¹⁸O_PO4

Δ δ¹⁸O_CO3-δ¹⁸O_PO4

δ¹³C_{diet, mequ}

MAP^a (mm/year)

MAP^b (mm/year)

MAT (°C)

 Phase III (11.70–11.60 Ma)

23

71.9

28.1

97.3

0.32

19

− 11.1

1.2

27.2

1.2

19

18.5

1.6

8.7

− 27.2

801

608

17.1

 Phase II (11.90–11.79 Ma)

15

83.3

16.7

100

0.16

13

− 11.4

1.2

27.7

1.2

6

19.8

1.7

8.2

− 27.5

992

765

20.3

 Phase I (12.33–11.95 Ma)

7

90.9

9.1

100

0.09

5

− 12.0

0.3

28.9

0.8

5

20.4

0.9

8.5

− 28.1

1190

928

21.8