摘要: In the Cambrian-Ordoviclan strata in the lower reaches of the Qingjiang River （western Hubei province）, many well-consolidated paleokarst breccia bodies of different sizes and occurrences have been observed. By studying them in detail and by introducing new ideas of modern sedimentology into the study, the authors described and classified these paleokarst breccias. Their forming conditions and mechanisms are also explained on the basis of our research on