PMC

Outcrop photographs of the Doi Long Formation. a) and b) Doi Wiang Ho (DWH) locality. c) The interbedding of limestone, sandy limestone, shale, and sandstone at the 434th km of the National Highway 11. d) Limestone outcrop of the Doi Long Formation at the Ban Sop Chang (SC) locality and a sponge (d1) from the middle part of the Doi Long Formation. e) Limestone outcrop at the Doi Huai Long (DHL) locality. f) Interbedding of limestone and shale in the upper part of the Doi Long Formation from the DHL locality.

Primary sedimentary structures in the Douira Formation. A Fine-grained interbedding of the upper portion of the Douira Formation underlying the Cenomanian-Turonian limestone B Fine-grained mudrock with vertical paleosol zonation and root traces.

(A) The upper part of the Djega outcrop showing the frequently alternating beds of sandstones and mudstones. (B–F) show the various lithofacies of the upper part of the outcrop as indicated in (A). (G) A shale bed, iron stained, characteristic of the lower part of the Djega outcrop. (H) A bed of concretion, sometimes nodular frequently interbedding the shales.

Trace-fossil specimens from the sandy contourite deposits at Sidi Chahed (A–D) and Kirmta (E–H) outcrops. (A, B) Scolicia in the sole of sandy clastic contouritic beds of Sidi Chahed; (C) Close-up view of Macaronichnus at Sidi Chahed; (D) Planolites within the interbedding of the foresets at Sidi Chahed. (E) Scolicia and some Macaronichnus at Kirmta; (F, G) Macaronichnus isp. and some Thalassinoides in the sole of sandy clastic contouritic beds at Kirmta; (H) Close-up view of Macaronichnus at Kirmta. Macaronichnus (Ma), Planolites (Pl), Scolicia (Sc), and Thalassinoides (Th).