[2] The formation mainly consists of marls and turbiditic sandstones and conglomerates deposited in the northeastern part of Hispaniola.

[5] In the vicinity of Esperanza,[6] La Toca Formation is cropping out in the northeast of the geologic map, while it is also present in the neighboring municipalities of Imbert and San Francisco Arriba.

The type section along the Bajabonico River shows volcaniclastic breccias with clasts originating from the Pedro García Formation.

The breccias are poorly stratified and contain angular clasts of vesicular basalts and andesites, polymictic conglomerates of various provenance and chlorite-rich feldspathic arenites.

[10] A second outcrop in Puerto Plata shows a less typical debris flow setting, with a varied sedimentological character.

[11] The section of La Toca Formation in Hermanas Mirabal Province displays a thick series of matrix supported conglomerates.

[13] Decades of study have led to an increased understanding of the invertebrate terrestrial fauna of the subtropical Early Miocene.