In the

Pays de Caux The Pays de Caux (, , literally ''Land of Caux'') is an area in Normandy occupying the greater part of the French '' département'' of Seine Maritime in Normandy. It is a chalk plateau to the north of the Seine Estuary and extending to the cl ...

Normandy Normandy (; or ) is a geographical and cultural region in northwestern Europe, roughly coextensive with the historical Duchy of Normandy. Normandy comprises Normandy (administrative region), mainland Normandy (a part of France) and insular N ...

France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...

a ''valleuse'' is a depression in the land surface of the

plateau In geology and physical geography, a plateau (; ; : plateaus or plateaux), also called a high plain or a tableland, is an area of a highland consisting of flat terrain that is raised sharply above the surrounding area on at least one side. ...

which permits access to the

sea A sea is a large body of salt water. There are particular seas and the sea. The sea commonly refers to the ocean, the interconnected body of seawaters that spans most of Earth. Particular seas are either marginal seas, second-order section ...

; it is sometimes translated into English as a "cliff hallow." On the rest of this

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 ...

, that access is prevented by the height of the

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 ...

cliff In geography and geology, a cliff or rock face is an area of Rock (geology), rock which has a general angle defined by the vertical, or nearly vertical. Cliffs are formed by the processes of weathering and erosion, with the effect of gravity. ...

s. There are three (major) sorts: * living valleuse (''valleuse vive''): a natural depression as at

Fécamp Fécamp () is a commune in the northwestern French department of Seine-Maritime. Geography Fécamp is situated in the valley of the river Valmont, at the heart of the Pays de Caux, on the Alabaster Coast. It is around northeast of Le Havre, ...

, Yport and

Étretat Étretat () is a Communes of France, commune in the Seine-Maritime Departments of France, department in the Normandy (administrative region), Normandy Regions of France, region of Northwestern France. It is a Tourism, tourist and Agriculture, far ...

. * dead valleuse (''valleuse morte''): to obtain the final access to the

beach A beach is a landform alongside a body of water which consists of loose particles. The particles composing a beach are typically made from Rock (geology), rock, such as sand, gravel, shingle beach, shingle, pebbles, etc., or biological s ...

it is necessary to set up a

stairway A stairwell or stair room is a room in a building where a stair is located, and is used to connect walkways between floors so that one can move in height. Collectively, a set of stairs and a stairwell is referred to as a staircase or stairway. ...

. * perched valleuse (''valleuse perchée''): a simple depression in the plateau surface which do not descend far enough to permit access to the beach. Elsewhere, it might be called a

hanging valley A valley is an elongated low area often running between hills or mountains and typically containing a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a ve ...

though it is formed, not by a glacier but by maritime

erosion Erosion is the action of surface processes (such as Surface runoff, water flow or wind) that removes soil, Rock (geology), rock, or dissolved material from one location on the Earth's crust#Crust, Earth's crust and then sediment transport, tran ...

. There are also three types by

stratigraphy Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy has three related subfields: lithost ...

: # Simple, # Resistant pedestal, and # Complex.

Origins

The word is peculiar to the Pays de Caux but the feature is not, though it shows itself particularly well there. The

valley A valley is an elongated low area often running between hills or mountains and typically containing a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over ...

s developed while the

water table The water table is the upper surface of the phreatic zone or zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with groundwater, which may be fresh, saline, or brackish, depending on the loc ...

was much higher in the chalk than it now is so that a

stream A stream is a continuous body of water, body of surface water Current (stream), flowing within the stream bed, bed and bank (geography), banks of a channel (geography), channel. Depending on its location or certain characteristics, a strea ...

flowed in each of these truncated valleys. It is likely that most of the formation of the valleys in the plateau occurred during cold periods. This region was never covered by an

ice cap In glaciology, an ice cap is a mass of ice that covers less than of land area (usually covering a highland area). Larger ice masses covering more than are termed ice sheets. Description By definition, ice caps are not constrained by topogra ...

but it has been only about 230 kilometres from one. In those circumstances, the conditions will have been

tundra In physical geography, a tundra () is a type of biome where tree growth is hindered by frigid temperatures and short growing seasons. There are three regions and associated types of tundra: #Arctic, Arctic, Alpine tundra, Alpine, and #Antarctic ...

, sometimes verging on

periglacial Periglaciation (adjective: "periglacial", referring to places at the edges of glacial areas) describes geomorphic processes that result from seasonal thawing and freezing, very often in areas of permafrost. The meltwater may refreeze in ice wedg ...

. When the frozen ground thawed in the spring, the surface soil was very wet because the melted snow and

ground water Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available fresh water in the world is groundwater. A unit of rock or an unconsolidat ...

could not sink into the

permafrost Permafrost () is soil or underwater sediment which continuously remains below for two years or more; the oldest permafrost has been continuously frozen for around 700,000 years. Whilst the shallowest permafrost has a vertical extent of below ...

. Any appreciable slope on the surface will have induced slumping and erosion but we have a plateau so the slopes were not originally great. During the glacial periods, the sea level was low enough to have emptied 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 ...

to the north of the Pays de Caux. The truncated valleys in the chalk, represent the headwaters of streams flowing down to what is now the bottom of the sea. During the

interglacial An interglacial period (or alternatively interglacial, interglaciation) is a geological interval of warmer global average temperature lasting thousands of years that separates consecutive glacial periods within an ice age. The current Holocene i ...

s the sea eroded the coast and steepened the slope down which they flowed but they will have required ever wetter conditions to keep the water table in the chalk sufficiently high to make the streams flow. In the end, the sea cut the cliff back quicker than the streams cut the valleys downward.

References

Geomorphology Landforms of Normandy Depressions (geology) {{stratigraphy-stub