The isotopic signatures of most ancient limestones indicated the same process.大多數(shù)古代石灰?guī)r的同位素特征說(shuō)明了同樣的過(guò)程.There are four principal types of limestones.石灰?guī)r有四種主要類(lèi)型.Soil: Altitude 260 meters, southeast orientation . Limestone gr...