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Table 1 Model ages of mare deposits.

The estimated model ages of the mare deposits range from 2.7 to 3.5 Ga.

The model ages of mare basalts investigated in our study range from 3.7 to 2.7 Gyr ago (i.e., from the Late Imbrian Epoch to the Eratosthenian Period).

As a result, the model ages of Units I, H and G were estimated as 3.52, 3.46 and 3.45 Ga, respectively.

Zircons from felsic granitoids also gave negative εHf(t) values of − 31.6 ± 0.5 to − 16.9 ± 0.9 with two-stage Hf model ages of 2.25 to 3.16 Ga.

We followed the commonly accepted techniques of statistical analysis of impact craters on planetary bodies, crater size-frequency distribution (CSFD) (Crater Analysis Techniques Working Group 1979), to estimate the absolute model ages of the formation of the target areas.

However, the CSFD for D > 500 m gives a model age of ∼3.7 Ga.

The derived model age of this deposit is estimated to be ∼2.7 Ga; hence, it is substantially younger than the Imbrian-Eratosthenian boundary (3.2 Ga).

From the CSFD for D ∼ 650 m, the model age of the underlaid flow is estimated to be ∼3.7 Ga, which is equivalent to that of the flow under the southern unit.

For the lava flow exposed in the northern unit, the CSFD for D < 450 m gives a model age of ∼3.3 Ga, younger than that of the southern unit (Table 1).

The model age of the southern unit is estimated to be 3.4 3.5 Ga from the CSFD for D < 400 m (Table 1); thus, it is classified as an Upper Imbrian Epoch.