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Description: The centralised data storage facilities of the Geological Survey of Finland (GTK) contain a total of over 700 000 bedrock and boulder observations. The observations have been gathered since the end of 19th century. The data system contains observations from 1905. Bedrock observations are spatial data, in which a large amount of attribute information are associated with a certain coordinate point. An observation consists of a rock outcrop or boulder located and positioned in the field, observations and measurements made as well as geochemical analyses performed. At the observation site, in addition to the outcrop or boulder, there may be an outcrop group, a littoral boulder field, frost-shattered bedrock, a rock profile, an investigation trench and a rock-cutting or quarry. The most usual data noted are the lithologies in the outcrop and their relative abundances, the structures that occur in the rock and tectonic measurements. The bedrock observations are produced in the GTK's own programmes: bedrock mapping, ore exploration, rock and mineral aggregate studies, dimension stone investigations (natural stone research) and urban mapping. The exploration activities of Outokumpu Oy, Rautaruuki Oy and Lapin Malmi Oy have also produced observations as well as similar ore investigations and bedrock mapping in projects carried out by various universities. The data sets from different sources are not commensurable and information on the quality of the data is partly lacking. The data consist of the following layers: bedrock observation point, main joint set trend, outcrop picture, rock type (lithology) observation point, sample information, tectonic measurements (structural geology measurements), dyke line, observation area, rock quality, rock type polygon (lithological polygon) and suitability. ‘BEDROCK.Bedrock_observation’ is a point layer that contains observations and data associated with the geographical locality of the bedrock or boulder observation as well as information on positioning accuracy, the observation process, the project, the source data set and date related details. ‘BEDROCK.Joint_set’ is a point layer, which contains data on the jointing measured at the observation site. ‘BEDROCK.Outcrop_picture’ is a point layer that contains data on the photographs and sketches associated with the observation. ‘BEDROCK.Rock_observation_point’ is a point layer that contains information and observations relating to the rock types (lithologies) at the observation site. ‘BEDROCK.Sample’ is a point layer that contains data on samples taken from the observation site and thin sections made from these, petrophysical measurements and geochemical determinations. ‘BEDROCK.Tectonic_measurement’ is a point layer that contains information on structural and tectonic parameters measured at the observation site. ‘BEDROCK.Dyke_line ’ is a line layer that contains dykes and related information outlined by the map maker at the observation site. ‘BEDROCK.Observation_area’ is an area layer that contains the external boundaries of the observation area. ‘BEDROCK.Rock_quality’ is an area layer that contains more precise data collected during dimension stone investigations, in research relating to rock construction and during urban mapping about the fracturing that occurs in the observation area as well as the quality of the rock types. ‘BEDROCK.Rock_type_polygon’ is an area layer that contains rock type areas (lithological areas) outlined by the map maker at the observation site. ‘BEDROCK.Suitability’ is an area layer that contains data gathered during dimension stone investigations and during rock and mineral aggregate studies about the suitability of the rock types in the observation area for further use.
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