La Herradura Formation: Geological Insights from Lower Cretaceous Peru
The La Herradura Formation (Spanish: Formación La Herradura) is a significant sedimentary sequence located in the Lima Province of Peru. Exposed near the coast at the beach of the same name, this formation provides critical evidence regarding the prehistoric marine environments of the region during the Early Cretaceous period.
Geologically, the formation is characterized by sediments that indicate a marine near-shore depositional environment, meaning the materials were deposited in shallow waters close to the coastline. This setting offers researchers a window into the coastal dynamics and sea-level fluctuations of ancient Peru.
[ไม่มีภาพประกอบ]Key Facts
- Age: Lower Cretaceous (specifically the Hauterivian stage).
- Location: Lima Province, Peru, near La Herradura beach.
- Environment: Marine near-shore deposition.
- Group Membership: Part of the Morro Solar Group.
- Structural Features: Normal faults are present within the formation at Morro Solar.
Stratigraphic Context
In the study of stratigraphy—the branch of geology concerned with the order and relative position of strata—the La Herradura Formation occupies a specific place within the regional sequence. It is a member of the Morro Solar Group.
The formation is positioned between two other major geological units. It overlies the Puente Piedra Group, meaning it was deposited on top of those older layers. Conversely, it is underlain by the Salto del Fraile Formation, which represents a subsequent period of deposition.
| Attribute | Details |
|---|---|
| Stratigraphic Range | Hauterivian (Lower Cretaceous) |
| Parent Unit | Morro Solar Group |
| Underlying Unit | Puente Piedra Group |
| Overlying Unit | Salto del Fraile Formation |
| Regional Location | Lima Province, Peru |
Geological Structure and Composition
The physical characteristics of the La Herradura Formation are marked by its sedimentary nature. One of the notable structural features observed in the Morro Solar area is the presence of normal faults. A normal fault occurs when the crust is extended, causing one block of rock to slide downward relative to the other.
Frequently Asked Questions
What is the age of the La Herradura Formation?
The formation dates back to the Lower Cretaceous period, specifically the Hauterivian stage.
Where can the La Herradura Formation be found?
It is exposed in the Lima Province of Peru, specifically near the beach of La Herradura.
What type of environment created these sediments?
The sediments reflect a marine near-shore depositional environment, indicating they were formed in shallow coastal waters.
Which geological group does this formation belong to?
The La Herradura Formation is a unit of the Morro Solar Group.
What formations are located immediately above and below it?
It overlies the Puente Piedra Group and is underlain by the Salto del Fraile Formation.