Poleta Formation

Occurrence

Geology

Members

• Lower Member: This member is the thickest of the three, getting up to thick. It is primarily composed of medium to light-gray oolitic limestone, containing an abundance of archeocyathid reefs. The limestone mostly well-bedded, although it is occasionally thin to very thin-bedded. There is also a single inter-stratified layer of greenish-gray or olive-gray siltstone, getting up to thick.
• Middle Member: This member in some areas gets up to thick. It is dominated by siltstones, limestones, and sandstones or quartzites. The siltstone layers are made up of grayish-olive, pale-olive, and locally pale-yellowish-brown or light-brown siltstone, shale, and phylitic silstone, which are composed of subangular silt-sized grains of quartz, embedded in a fine-textured matrix of muscovite or mica clay, and chlorite. The limestone layers are composed of medium-gray to grayish-orange or mottled-gray to light-brown aphanitic to medium crystalline limestone, which is inter-stratified with occasional siltstone. The sandstone or quartzite layers are primarily pale-brown, light-brown and very-pale-orange, very fine to fine grained and commonly evenly laminated. In some areas, these layers can grade into a coarse siltstone. They also contain quartz and feldspars.
• Upper Member: This member is the thinnest, only getting up to thick. It is mostly composed of medium-gray limestone, which is very thin to thin-bedded. It also contains a few archaeocyathid fossils.

Depositional setting

Taphonomy

Paleobiota

Arthropoda

Lophotrochozoa

Chancelloriidae

Cnidaria

Porifera (Sponges)

Echniodermata

Foraminifera

Petalonamae

''incertae sedis''

Flora

Ichnogenera