Original sentence: (ENSO) history.Climate indicators are, by far, less abundant for ancient cold seas; therefore, investigating the ability of C.There are many fossil shell accumulations in Pleistocene coastal terraces.concholepas shell is also a potential proxy-bearer for climate change studies.concholepas will provide valuable signals for long-term evolution of the sea surface temperatures in cold seas, and might be important in reconstructing the El Niño Southern Oscillation