英语语法分析

Jiangnan Old Land stratigraphic region and Cathaysian stratigraphic region.

扬子地层区、江南古陆地层区及华夏地层区。

It is a direct evidence of the strong differentiation in Cathaysian floral province.

此外，该类在本区的发育是华夏植物地理区分化渐趋强烈的直接证据。

South China (studying area) is composed of the Cathaysian block and the southeastern part of Yangtze block.

华南(研究区)由杨子地块东南部和华夏地块组成。