Costa Rican Eocene–Oligocene carbonate deposits have been known for more than a hundred years, however, there are few scientific contributions detailing the relation between facies analysis and regional basin evolution. Based on a detailed study in southern Costa Rica, a chronologic history of a Bartonian–Aquitanian sedimentary succession is proposed. The carbonate facies analysis allows for eight microfacies (MF1 to MF8) to be distinguish. The siliciclastic facies analysis permits identification of two main periods of sandstone deposition and one of shale formation. The mixed sandstone/carbonate succession exhibits three main periods of deposition: (1) Bartonian–lower Priabonian, represented by distal, relatively deep slope-to-basin environments. Deposits comprise thick accumulation of sandstones, calcareous breccias, and calciturbidites. This period terminates with a stratigraphic erosion surface; (2) Upper Priabonian–Rupelian, represented by more proximal, shallow to mid depth inner to middle ramp environments. Deposits are composed of peloidal/cortoidal grainstone, foraminiferal-algal rudstones, and rhodolith rudstones. This period terminates with a second stratigraphic erosion surface; (3) Chattian–Aquitanian, represented by proximal to distal, shallow to coastal and offshore environments. Deposits are composed of a mixed siliciclastic carbonate thin complex overlain by dark shale.

The vertical and lateral facies changes permit a basin evolution model that is closely controlled by subsidence. Local tectonic uplift may have formed the first subaerial exposure surface. The second subaerial exposure surface may have been controlled by eustatic sea-level variations over relatively shallow water deposits. These results, the first-of-their-kind in the southern Costa Rican Fila Costeña, could permit improvements of lateral regional correlations by bringing new lithostratigraphic layers of reference.

哥斯达黎加始新世-渐新世的碳酸盐矿床已经有一百多年的历史了，但是，很少有科学贡献详细描述相分析与区域盆地演化之间的关系。根据对哥斯达黎加南部的详细研究，提出了Bartonian-Aquitanian沉积演替的年代史。碳酸盐相分析允许区分八个微相（MF1至MF8）。硅质碎屑相分析可以确定砂岩沉积的两个主要时期和一个页岩形成的时期。混合的砂岩/碳酸盐岩演替过程表现出三个主要沉积期：（1）巴尔通期至下三角洲，以远端，较深的斜坡至盆地环境为代表。沉积物包括厚厚的砂岩，钙质角砾岩和钙铁矿。这一时期以地层侵蚀面为终点。（2）较高的Priabonian–Rupelian，表现为较近端，浅至中深度的内部至中间斜坡环境。沉积物是由胶体/皮质的花岗石，有孔虫-藻类安息石和杜鹃石安息石组成的。这一时期以第二个地层侵蚀面终止；（3）Chattian–Aquitanian，以近端到远端，浅层到沿海和近海环境为代表。沉积物由深色页岩覆盖的混合硅质碳酸盐薄层复合物组成。这一时期以第二个地层侵蚀面终止；（3）Chattian–Aquitanian，以近端到远端，浅层到沿海和近海环境为代表。沉积物由深色页岩覆盖的混合硅质碳酸盐薄层复合物组成。这一时期以第二个地层侵蚀面终止；（3）Chattian–Aquitanian，以近端到远端，浅层到沿海和近海环境为代表。沉积物由深色页岩覆盖的混合硅质碳酸盐薄层复合物组成。

垂直和横向相的变化使得盆地演化模型受到沉降的严格控制。局部构造隆升可能已经形成了第一层地下暴露面。可以通过相对浅水沉积物上的欢乐海平面变化来控制第二个地下暴露面。这些结果是哥斯达黎加南部费拉科斯塔尼亚（Costa Rican FilaCosteña）的同类中首例，可以通过引入新的岩石地层学参考层来改善横向区域相关性。