Figure 2.
Temporal variations in δ13C of carbonates and coexisting organic matter in the Polarisbreen Group, Spitsbergen. The two Varanger glaciations are recorded in member E2 of the Elbobreen Formation and the Wilsonbreen Formation. The W2 dolomites are considered to represent glacio-lacustrine deposits (39). Similarly, carbonates in the D4-D6 interval of the overlying Dracoisen Formation likely formed in highly restricted to lacustrine environments (33, 35, 37). Analyses represented by open triangles are from Knoll et al. (4); squares represent analyses from Fairchild and Spiro (39). Open circles represent marly samples containing <50% carbonate; filled circles represent samples with >50% carbonate.