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Fig. 4 | Progress in Earth and Planetary Science

Fig. 4

From: Litho-, bio-, and chemostratigraphy of the Middle Triassic carbonate succession in the North-Central Coast Region of Vietnam

Fig. 4

Microfacies of the studied carbonates. a Sandy limestone with peloids, unit 1, 117.0 mdfrh in core no. 1, sample 1-140. Note bioturbation (arrows). b Microbialites (m) with a matrix of peloidal packstone (pp), unit 2, 105.5 mdfrh in core no. 1, sample 1-128. Note poorly laminated micritic mass binding peloids (arrows) derived from the peloidal packstone matrix. c Peloidal packstone, unit 2, 67.4 mdfrh in core no. 1, sample 1-86. d Dolomitized oncoidal floatstone, unit 3, 51.2 mdfrh in core no. 1, sample 1-67. Note oncoids (arrows) and dolomite rhombs (do). e Peloid bioclast packstone, unit 4, 156.5 mdfrh in core no. 4, sample 4-139. Note bioclasts of dasycladalean algae (arrows) and echinoid (double arrowhead) and thick micrite envelopes (white arrowheads). f Peloid bioclast packstone rich in dasycladalean algae (arrows), unit 5, 140.8 mdfrh in core no. 4, sample 4-123. g Microbialite (m) with a matrix of peloidal grainstone (PG), unit 5, 98.3 mdfrh in core no. 4, sample 4-86. Note a gastropod (g) with a thick micrite envelope (arrowhead) h Bioclastic grainstone, unit 6, 38.5 mdfrh, sample 4-35, in core no. 4. Note bioclasts of dasycladalean algae (arrows) and a thin-shelled bivalve (arrowhead). Scale bar, 1 mm

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