Shell sand - areas

Shell sand occurrences show areas in the coastal zone with information about shell sand on the seabed, either based on mapping in the field or modeling. Sediments with a calcium carbonate content > 50% and consisting of whole or crushed calcerous shells are described as shell sand or shell gravel.

Date (Creation): 2005-01-01

Date (Publication): 2015-05-10

Date (Revision): 2023-12-12

Code: skjellsand_omrader

Purpose: Shell sand is formed by partially decomposed calcerous shells from marine organisms. The most important organisms in the formation of shell sand are shells, snails, rur, sea urchins, calcareous worms and calcareous algae. Skjellsand occurs mainly where there are bottom currents and wave activity, and is considered as a non-renewable resource. Shell sand is a very important habitat type because it is often rich in soft bottom fauna, and because it is a prefferred spawning and rearing environment for several fish species. Larger crustaceans use banks of shell sand for mating sites and for moulting. Norway is one of the few countries in the world that has larger occurrances of this type of habitat, so we have a special responsibility for sustainable management of the ressource.

Status: Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Geological Survey of Norway	Aave Lepland	Aave.Lepland@ngu.no	Publisher
Geological Survey of Norway	Reidulv Bøe	Reidulv.Boe@ngu.no	Owner

Maintenance and update frequency: As needed

GEMET - INSPIRE themes, version 1.0

Geologi
Habitater og biotoper
Jordarter
Havområder
Mineralressurser

Nasjonal inndeling i geografiske initiativ og SDI-er

Norway Digital
Felles datakatalog

Nasjonal tematisk inndeling (DOK-kategori)

Geologi
Natur
Kyst og fiskeri

Place

Norge
Norskekysten
Troms
Finnmark
Vestfold
Telemark

Administrative enheter i Norge

Theme

seabed
coast
fjord
marine
shell gravel
shell sand
sediment
sedimentation
resource
biodiversity
modelling
mapping
calcerous
shell sand areas

SOSI produktspesifikasjon

Keywords

NGU
NIVA

Spatial scope

National

Specific usage: The data set can be used as a basis in overall area, resource and environmental planning, habitat mapping, vulnerability analyzes, impact assessments in connection with installations on the seabed, etc.

User contact info

Organisation name	Individual name	Electronic mail address	Role
			Owner

Use limitation: Detaljnivået på de ulike data tilsier bruk innenfor kartmålestokken: 1:5 000-50 000

Access constraints: Other restrictions

Other constraints: Åpne data

Use constraints: Other restrictions

Other constraints: Norsk lisens for offentlige data (NLOD) 2.0

Classification: Unclassified

User note: NLOD

Spatial representation type: Vector

Denominator: 5000, 10 000

Language: Norwegian

Topic category

Geoscientific information

Unique resource identifier: EPSG:4258

Unique resource identifier: EPSG:25833

Distribution format

Name	Version
Shape
FGDB
SOSI
FGDB
GML
SOSI
FGDB
GML
SOSI

Units of distribution: fylkesvis

OnLine resource

Protocol	Linkage	Name
OGC:WMS	https://geo.ngu.no/mapserver/MarinNaturtyperWMS2?REQUEST=GetCapabilities&SERVICE=WMS

Hierarchy level: Dataset

Domain consistency

Conformance result

Title: SOSI produktspesifikasjon: Skjellsandområder

Date (Publication): 2023-06-19

Title: sosi

Date

Explanation: The data is not evaluated according to the product specification

Conformance result

Title: Sosi applikasjonsskjema

Date (Publication): 2023-06-19

Title: uml-sosi

Date

Explanation: SOSI files are not evaluated according to application form

Conformance result

Title: Sosi applikasjonsskjema

Date (Publication): 2023-06-19

Title: uml-gml

Date

Explanation: GML files are not evaluated according to application form

Statement: Areas of mapped shell sand occurrancesare are based on video observations, sampling, ground seismic and interpretation of detailed bathymetry data. The data is digitized, processed and systematised using ESRI ArcGIS tools. Shell sand deposits are classified as 'Proven' where the deposit has been mapped based on detailed bathymetry data and seismic, and verified by sampling, and 'Possible' where the occurance is only estimated using acoustic mapping methods without sampling. The dataset is interpreted and digitized by NGU based on data from NGU and the Mapping Authority. Modeled shell sand areas have been prepared by NIVA as a part of the 'National program for mapping biological diversity, coastal'. The models are based on geological data collected by NGU, as well as currents, waves, bathymetry and parameters derived from bathymetry data. Modeled shell sand areas show where shell sand can be formed under current conditions and where one can expect to find shell sand.