Extended Data Fig. 4: Microscope and field photographs.
From: Proto-monsoon rainfall and greening in Central Asia due to extreme early Eocene warmth
A) and B) Cross-polarized and cathodoluminescence image of a mudrock sample with vadose-grown calcite cement (18LD-15; Ledu section; -15 meter-level) showing silt-sized matrix with dispersed organic matter, dull luminescent micrite and some luminescent microsparite and sparite. Plane-polarized images of pedogenic nodules showing: C) Micrite matrix with floating detrital grains in 18LD+4nodB (Ledu section; 12.3 meter-level). D) Floating detrital grains with isopachous microsparite to sparite rim and micritic matrix in 18LDconglonod (Ledu section; -60 meter-level). Massive red dolomitic mudrock samples showing rhombohedral dolomite crystals in E) plane-polarized light (15CJ-111_75; Caijia section 131.25 meter-level) and F) SEM (15CJ-112_5; Caijia section; 132 meter-level). G) Greenish lacustrine mudrocks interbedded with massive dolomite beds (Caijia section; 75 meter-level), hammer for scale. H) Dolomite-filled burrow (Caijia section; 93 meter-level).
