The Wessex Basin (United Kingdom) includes hundreds of meters of Lower Cretaceous clays, silts, and sands deposited in a wide range of depositional environments. Studies have investigated these depositional systems from the organic matter (OM) perspective. However, questions remain concerning the composition, source, and the overall depositional constraints on the distribution of sedimentary OM in this area. Elemental (carbonate % and total organic carbon - TOC) and pyrolysis analyses were conducted on representative lithofacies of the Lower Cretaceous from the Wessex Basin at the Compton Bay and Atherfield sections, Isle of Wight. The highest TOC contents were determined in the upper part of the Ferruginous Sands and Sandrock formations. These elevated TOC intervals are associated with predominantly estuarine deposition. Except for one sample from the Vectis Formation, Hydrogen Index (HI) in all studied units is low and indicates Type IV kerogen assemblages, interpreted to be linked with strongly variable climates (with pronounced dry periods) and significant water table fluctuations in the source area and during transport. The one sample with a Type II-III kerogen assemblage from the lagoonal Vectis Formation supports previous studies which suggested that OM in the Vectis Formation varied vertically as a function of fluvial sediment and terrestrial organic matter input to the lagoonal environment with changes in salinity, sediment resuspension, and turbulence as a result controlling the abundance of dinoflagellate cysts.

韦塞克斯盆地（英国）包括沉积在各种沉积环境中的数百米的下白垩统粘土，淤泥和沙子。研究已经从有机物（OM）的角度研究了这些沉积系统。但是，仍然存在有关该地区沉积物OM分布的组成，来源和总体沉积约束的问题。对怀特岛康普顿湾和阿瑟菲尔德地区威塞克斯盆地下白垩统的代表性岩相进行了元素分析（碳酸盐％和总有机碳-TOC）和热解分析。在铁质砂和砂岩地层的上部确定了最高的TOC含量。这些升高的TOC间隔主要与河口沉积有关。除了来自Vectis地层的一个样本外，所有研究单位中的氢指数（HI）均较低，表明IV型干酪根组合，被解释为与强烈变化的气候（干旱期明显）和源区地下水位明显波动有关在运输过程中。一个来自泻湖Vectis组的II-III型干酪根组合的样品支持以前的研究，该研究表明，Vectis组中的OM随河流沉积物和陆生有机质输入盐湖，沉积物的变化而垂直变化。重悬液和湍流，从而控制了鞭毛藻囊肿的数量。解释认为这与气候变化剧烈（干旱期明显）以及源区和运输过程中地下水位的明显波动有关。一个来自泻湖Vectis组的II-III型干酪根组合的样品支持以前的研究，该研究表明，Vectis组中的OM随河流沉积物和陆生有机质输入盐湖，沉积物的变化而垂直变化。悬浮和湍流，从而控制了鞭毛藻囊肿的数量。解释认为这与气候变化剧烈（干旱期明显）以及源区和运输过程中地下水位的明显波动有关。一个来自泻湖Vectis组的II-III型干酪根组合的样品支持以前的研究，该研究表明，Vectis组中的OM随河流沉积物和陆生有机质输入盐湖，沉积物的变化而垂直变化。重悬液和湍流，从而控制了鞭毛藻囊肿的数量。