Fig. 5. Some important conodont species from the Qidong Section,

HUABn.

1-4 Palmatoiepis quadrantinodosalobata Sanoemann, QI32i'0. l4;

5 Polygnathus nodocostafus Helms, QD1/1.16;

6 — 8 lcriodus cof'brutus Sannemann, QD3t9.1;

9 lcriodusiowaensis YourIquist and Peterson, QD339.1;

10 Pelekysgnathusinc/inafus Thomas, QD517.49;

11 IcriodusiowaensI's YounqLIIst and Peterson, QD3I1.16
Scale bar =200 rnicrons

The @noma.ious bed consists of 3-5 em of red shale (clayish shale) sandwiched between limestone and marl beds. The floor of the red shale yields lcriodusiowaensis (of its upper horizon) and Icriodus cornurus. The horizon of the anomaly bed is at the upper part of the crepida Zone. The red shale is anomalously enriched in siderophile ele-