Marble Falls Formation

Mostly v fine grained some fine to medium grained in part cherty thin to thick bedded oolitic near middle various shades of brownish gray med gray and olive gray microfossils abundant in most beds.

Marble falls formation.

Various contributors to the paleobiology database. It is composed primarily of the mineral calcite caco 3 and usually contains other minerals such as clay minerals micas quartz pyrite iron oxides and graphite under the conditions of metamorphism the calcite in the limestone recrystallizes to form a rock that is. It preserves fossils dating back to the carboniferous period. Prior to 2010 approximately 2 500 wells were completed in the marble falls formation.

If morrow beds are present at all in type marble falls only a small part of lower part could be so classified and until some evidence of its morrow equivalence is found beds at marble falls should be regarded as post morrow in age. Geologic unit mapped in texas. Llano sheet 1981 along colorado river in type section upper 270 ft mostly ls some spiculite beds in upper part. Geologic map of the marble falls area burnet county texas 1 0 1 2 3 km 1 63 360 geology from geologic atlas of texas llano sheet 1431 2147 281 oh ipsw.

Water occurs in fractures and solution cavities in the limestone of the marble falls formation of the pennsylvanian bend group. The rock has poor primary porosity and according to jim henry a consulting geologist in the area the true marble falls of the fwb is an impure calcareous rock that contains a large amount of silica in the form of sponge spicules quartz sand and shale. List of fossiliferous stratigraphic units in texas. The marble falls formation is a geologic formation in texas.

Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. The marble falls has great potential to be a prolific tight oil horizontally fractured play. Other displays include the always popular farm and ranch life history of the schools of marble falls geology lakes rivers and dams. The marble falls aquifer occurs in several separated outcrops along the northern and eastern flanks of the llano uplift.

To accompany this collection the kitchen without electricity display takes visitors back to a simpler time. Presence of fusiform fusulinids in marble falls limestone indicates that formation is post morrow in age. The modern marble falls play in the western edge of the fort worth basin is an exciting new unconventional oil and gas play.