High Peak (also known as Peak Hill) is a hill which is partially eroded, resulting in a cliff face, on the

English Channel The English Channel, also known as the Channel, is an arm of the Atlantic Ocean that separates Southern England from northern France. It links to the southern part of the North Sea by the Strait of Dover at its northeastern end. It is the busi ...

coast A coast (coastline, shoreline, seashore) is the land next to the sea or the line that forms the boundary between the land and the ocean or a lake. Coasts are influenced by the topography of the surrounding landscape and by aquatic erosion, su ...

to the southwest of

Sidmouth Sidmouth () is a town on the English Channel in Devon, South West England, southeast of Exeter. With a population of 13,258 in 2021, it is a tourist resort and a gateway to the Jurassic Coast World Heritage Site. A large part of the town has ...

Devon Devon ( ; historically also known as Devonshire , ) is a ceremonial county in South West England. It is bordered by the Bristol Channel to the north, Somerset and Dorset to the east, the English Channel to the south, and Cornwall to the west ...

, southern

England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...

. Its highest point is about above sea-level. It features a partially eroded

Iron Age The Iron Age () is the final epoch of the three historical Metal Ages, after the Chalcolithic and Bronze Age. It has also been considered as the final age of the three-age division starting with prehistory (before recorded history) and progre ...

hill fort A hillfort is a type of fortification, fortified refuge or defended settlement located to exploit a rise in elevation for defensive advantage. They are typical of the late Bronze Age Europe, European Bronze Age and Iron Age Europe, Iron Age. So ...

, with pre-

Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of Roman civilization *Epistle to the Romans, shortened to Romans, a letter w ...

and post Roman pottery found there.

History

On the edge of the cliff there are the remains of significant earthworks, which have been variously shown as having Iron Age,

and

Dark Age The ''Dark Ages'' is a term for the Early Middle Ages (–10th centuries), or occasionally the entire Middle Ages (–15th centuries), in Western Europe after the fall of the Western Roman Empire, which characterises it as marked by economic, int ...

occupation. Geological study, and the lines of the earthworks, suggest that the site once extended several tens of metres into what is now eroded away. General interpretation suggests that it was an Iron Age defensive site which saw re-use in the Dark Age period, perhaps as a coastal

trading station A trading post, trading station, or trading house, also known as a factory in European and colonial contexts, is an establishment or settlement where goods and services could be traded. Typically a trading post allows people from one geograph ...

.R.R.Sellman; Aspects of Devon History, Devon Books 1985 - - Chapter 2; The Iron Age in Devon. Map Page 11 of Iron Age hill forts in Devon includes High Peak.

Geology

Within the cliffs below High Peak and Chit Rocks a number of very rare

fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserve ...

s of

Triassic The Triassic ( ; sometimes symbolized 🝈) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.4 Mya. The Triassic is t ...

fish, reptiles and amphibians have been found. There are four rock

strata In geology and related fields, a stratum (: strata) is a layer of Rock (geology), rock or sediment characterized by certain Lithology, lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by v ...

in the cliff face of High Peak. The base of the cliffs are formed by the

Otter Sandstone Formation The Otter Sandstone Formation is an obsolete geological unit in England, now referred to as the Helsby Sandstone Formation.http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=HEY (BGS on-line lexicon of rock units) It preserves fossils dated to the Tr ...

and were deposited in a hot dry climate in the Triassic Period about 220 million years ago. The deposits in the centre of the cliff face are from the

Mercia Mudstone Group The Mercia Mudstone Group is an early Triassic lithostratigraphy, lithostratigraphic group (stratigraphy), group (a sequence of rock strata) which is widespread in Britain, especially in the English Midlands—the name is derived from the ancient ...

from about 200 million years ago. Above these Triassic formations, there are layers of

Upper Greensand Greensand or green sand is a sand or sandstone which has a greenish color. This term is specifically applied to shallow marine sediment that contains noticeable quantities of rounded greenish grains. These grains are called ''glauconies'' and co ...

, a

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

rock formation about 80 million years old. The top of High Peak is underlain by

flint Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start ...

gravel Gravel () is a loose aggregation of rock fragments. Gravel occurs naturally on Earth as a result of sedimentation, sedimentary and erosion, erosive geological processes; it is also produced in large quantities commercially as crushed stone. Gr ...

that was probably left behind following the dissolution of an original cover of

chalk Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton that had settled to the sea floor. Ch ...

during the early

Paleogene The Paleogene Period ( ; also spelled Palaeogene or Palæogene) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period Ma (million years ago) to the beginning of the Neogene Period Ma. It is the fir ...

period about 60 to 66 million years ago.

References

Bibliography

* {{Jurassic Coast Cliffs of England Coasts of England Geology of Devon Hill forts in Devon Hills of Devon Jurassic Coast