This thickness may vary from only one or two meters in Texas to several hundred meters in the North Sea and Middle East. 总产层的厚度变化很大,从德克萨斯油田的1-2米,到北海和中东油田的几百米不等。
The wild orchidaceous plants were mostly distributing under sidehill trees, beside hollow rivulet or on trees at 400 ~ 1300 meters altitudes of north coteau of in the area. 本区兰科植物主要分布在北部山区,海拔400~1300m的山坡林下、山谷溪旁和树上。