在得克萨斯州拉瓦卡县内,下始新统威尔科克斯层的沉积岩被页岩填充的峡谷所切割(图1),有三个已被认识并称之为河道:约克姆(yoakum),斯莫德斯(Smothers)和拉瓦卡(Lavaca)。但在本文中为了避免混淆,称它们为峡谷。对那些峡谷的沉积环境是有争议的,到底是浊积扇还是河流三角洲扇。近期的 In Lavaca County, Texas, the sediments of the Lower Eocene Wilcox layer were cut by shale-filled canyons (Figure 1), three of which have been known and are called river courses: yoakum Smothers and Lavaca. But in this article, to avoid confusion, we call them canyons. The sedimentary environment of those canyons is controversial, in the end is turbidite fan or river delta fan. recently