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Fig. 9 | Progress in Earth and Planetary Science

Fig. 9

From: Distribution, morphology, and morphometry of circular mounds in the elongated basin of northern Terra Sirenum, Mars

Fig. 9

Crater count-based model age determination. a, b Part of northern Terra Sirenum (Fig. 1) (c, d), the upper rugged unit (Fig. 2c). a Mapped impact craters with diameters > 10 km (red circles) on a sample region (blue rectangle) surrounding the study area (white rectangle). Base map is from the daytime THEMIS infrared image mosaic (100 m/pixel) which was used to mark the craters. Solar illumination is from the left of the scene. b Cumulative size-frequency plot of the impact craters of > 100 m diameter (N = 348). Production function curve is fitted to the diameter range of 50 to 175 km. c Identified impact craters > 100 m diameters (red circles, N = 4549) on the upper rugged unit (blue outlines). The CTX image mosaic (base map) was used to map the craters. d Cumulative crater size-frequency distribution and absolute model ages. Production functions fitted to the three ranges of the crater diameters: 1.2–1.5 km (black), 0.6–1.0 km (red), and 150–500 m (red). Red plots indicate the resurfacing correction (Michael and Neukum 2010)

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