A suite of terrestrial-marine transitional carbonate beds occur in the Lower Tertiary of the Kuqa Basin,Xinjiang. The pebbly coquina, Paleocene in age, is distributed along the southern pediment of the TianshanMountains north of Baicheng, where Pb-mineralization has been observed for the first time. The pebbly coquina consists of well-rounded quartzitic pebbles, quartz sands, shell fossils, shellfragments and equigranular fecal pellets. Four types of carbonate minerals have been revealed: 1) euhedral dolomite (Mg_(60)Ca_(40)CO_3, 2) anhedraldolomite (Mg_(57)Ca_(43))CO_3, 3) dolomitic calcite (Mg_(20)Ca_(80))CO_3 and magnesitic dolomite with a trace amountof Pb(Mg_(73)Ca_(27))CO_3. Five types of galena filling the pebbly coquina have been found: 1) in the shell tower end, 2) on the innershell wall, 3) on the outer shell wall, 4) around the shell wall, and 5) among shell fragments. The galenareplacement took place mainly in the early stage of diagenesis. Stable isotope analyses show δ~(13)C values rangefrom -0.8 to +2.3 and δ~(18)O values from -0.1 to +0.5, indicating a marine environment under theinfluence of fresh water, which is consistent with the result of megascopic facies analysis in paleogeography. It is concluded that the discovery of galena in the Tertiary pebbly coquina in the north of Baicheng,Xinjiang may provide new clues to the searching for strata-bound Pb-Zn deposits in the vast area of northernTarim Basin. A suite of terrestrial-marine transitional carbonate beds occur in the Lower Tertiary of the Kuqa Basin, Xinjiang. The pebbly coquina, Paleocene in age, is distributed along the southern pediment of the Tianshan Mountains north of Baicheng, where Pb-mineralization has been observed for The first time. The pebbly coquina consists of well-rounded quartzitic pebbles, quartz sands, shell fossils, shellfragments and equigranular fecal pellets. Four types of carbonate minerals have been revealed: 1) euhedral dolomite (Mg 60 Ca 40 CO 3 2) anhedraldolomite (Mg_ (57) Ca_ (43)) CO_3, 3) dolomitic calcite (Mg_ (20) Ca_ (80)) CO_3 and magnesitic dolomite with a trace amount of Pb (Mg_ (73) Ca_ 5 types of galena filling the pebbly coquina have been found: 1) in the shell tower end, 2) on the innershell wall, 3) on the outer shell wall, 4) around the shell wall, and 5) among shell fragments. The galenareplacement took place mainly in the early stage of diagenesis. Stable isotope analyzes show δ ~ ( 13) C values ​​range from -0.8 to +2.3 and δ ~ (18) O values ​​from -0.1 to +0.5, indicating a marine environment under the fluid of fresh water, which is consistent with the result of megascopic facies analysis in paleogeography. It is that that discovery of galena in the Tertiary pebbly coquina in the north of Baicheng, Xinjiang may provide new clues to the searching for strata-bound Pb-Zn deposits in the vast area of ​​northern Tarim Basin.