Table 1. Synoptic listing of microfossil taxa from the Dahongyu Formation, Jixian section, indicating their size ranges and morphological characteristics. A. umishanensis = Asperatopsophosphaera umisha- nensis,N. = Number, L. = Length, W. = Width.


Size Species/Taxa


Oscillatoriopsis obtusa Oscillatoriopsis amadeus Oscillatoriopsis longa Oscillatoriopsis princeps Siphonophycus thulenema Siphonophycus septatum Siphonophycus robustum Siphonophycus typicum Siphonophycus kestron


Glenobotrydion varioforme Eosynechococcus moorei Coccostratus dispergens Gloeodiniopsis sp. Tetraphycus gregalis


Coniunctiophycus majorinum Clonophycus sp.


Myxococcoides grandis Myxococcoides sp. Leiosphaeridia spp.


Xiaohongyuia sinica Shi and Feng n. gen. n. sp. Unnamed Form 1 Unnamed Form 2 Unnamed Form 3 Unnamed Form 4 Unnamed Form 5 Unnamed Form 6 Unnamed Form 7


Dictyosphaera macroreticulata Leioarachnitum sp.


Leiosphaeridia minutissima Pterospermopsimorpha sp. A. umishanensis


Range


L 2.5–4.5/W3.8–7.7 L3–5.5/W8–14


L 3.8–7.4/W 2–3.5 2.5–6


W0.3–0.6 W1.0–2.0 W2.0–4.0 W4.0–8.0 W8.0–16.0 2.5–6.5


2.5–4.5 1.5–5


19–68


L 8–53/W 4–27 W15.5–45


38.5–126.5 26.7–55.4 40.5–49.5


40–589.5 31–45


30–57.5 11–35 7–22


L 39.5–49/W 29–32 30–34


L 41/W 25 L 50/W 30


76–80


L 336/W 248 25–101


Mean N Morphological characteristics 3.7/6.2


L 3.3–6/W14–24.8 3.8/19.1 104 Unbranched trichome without sheath; cell width is 14–25 μm; cell length is smaller than width L5–10.5/W25–35.8 7.4/29.5 30 Unbranched trichome without sheath; cell width is 25–50 μm; cell length is smaller than width 99 Unbranched, nonseptate and smooth-surfaced tubular filaments; 0.5 μm in width 57 Unbranched, nonseptate and smooth-surfaced tubular filaments; 1–2 μm in width 107 Unbranched, nonseptate and smooth-surfaced tubular filaments; 2–4 μm in width 158 Unbranched, nonseptate and smooth-surfaced tubular filaments; 4–8 μm in width 8 Unbranched, nonseptate and smooth-surfaced tubular filaments; 8–16 μm in width 54 Cell-like units with one to a few spherical or irregular shaped inclusions 22 Colonially preserved oblong, rod-shaped to ellipsoidal cell-like units. 22 Colonially preserved spheroidal cell-like units


4/12


0.5 1.7 2.8 5.5 9


5.2/2.8 4.5


4.5


43.5 21.5 14


27.2 3.5 3.5


104 35


72.2 35.5 45


31/15 29


78.3 — —


44.3/30.5 32


— 63


28 Unbranched trichome without sheath; cell width is 3–8 μm; cell length is smaller than width 30 Unbranched trichome without sheath; cell width is 8–14 μm; cell length is smaller than width


41 Colonially preserved small spheroidal to ellipsoidal units of vesicles 12 Spherical coenobium


27 Un-compressed and smooth-surfaced spherical vesicles 67 Un-compressed spherical vesicles 273 Smooth-surfaced spherical microfossils


5 Smooth-surfaced spherical microfossils with thin cell wall 15 Solitary spherical microfossils with a large, spherical dark inclusion 15 Spherical cells with granular surface


2 Spherical cells with reticulate sculptures on their surface


23 Fusiform units with a medial split that is parallel to the long axis direction 46 Irregular-shaped microfossils


1 Cell pairs within a common organic wall; outer wall is coarsely granulated 1 Cell pairs without envelope 2 Dividing cells


3 Spherical cell with a broken neck-like extension


2 Spherical microfossils with a single spine-like structure on its surface 1 Vase-like microfossil with a neck-like structure


2 Vesicle with short and loosely distributed spine-like ornamentation Figure


Fig. 3.1 Fig. 4


Fig. 6.2 (arrow) Fig. 6.5 (arrow) Fig. 6.5 Fig. 5


Fig. 3.5, 3.6 Fig. 6.1, 6.2


Fig. 3.4


100 Colonially preserved spherical microfossils with thin, transparent, smooth-surfaced flexible wall Fig. 8.1–8.12 18 Tetrads surrounded organic amorphous matrix


Fig. 7.1a, 7.2 Fig. 7.1b Fig. 7.3


Fig. 9.1, 9.2 Fig. 9.3, 9.4 Fig. 9.5–9.8 Fig. 9.9


Fig. 10.6–10.9 Fig. 10.10, 10.11 Fig. 11.1–11.5 Fig. 12.1–12.16


Fig. 11.8 Fig. 11.9 Fig. 11.10 Fig. 11.11 Fig. 11.12 Fig. 11.13


Figs. 9.10–9.18, 10.1–10.5 Fig. 11.6, 11.7 Fig. 9.19


Fig. 7.4, 7.5


Fig. 11.14, 11.15


Shi et al.—Silicified Paleoproterozoic microbiota from China


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