Following the unanimous approval of the Executive Committee on the International Union of Geological Sciences as notified on April 8,2016,the Global boundary Stratotype Section and Point for the base of the Albian Sta...Following the unanimous approval of the Executive Committee on the International Union of Geological Sciences as notified on April 8,2016,the Global boundary Stratotype Section and Point for the base of the Albian Stage of the Cretaceous is defined at the first occurrence datum of the planktonic foraminiferan Microhedbergella renilaevis Huber and Leckie,2011 at a level 37.4 meters above the base of the Marnes Bleues Formation and 40 cm above the base of the Niveau Kilian marker bed in the section SSE of the Col de Pré-Guittard,Arnayon,Drôme,France.The first occurrence of Microhedbergella renilaevis is placed within a 100-m section of argillaceous sediments with 28 secondary markers including calcareous nannofossils,planktonic foraminifera,an inoceramid bivalve,ammonites,stable carbon isotopes,and local marker beds.展开更多
Petit Granit is a Carboniferous grey-bluish crinoidal limestone that becomes shiny black when polished.The rock is known under several other names including Pierre bleue(Blue stone),but it should not be confused with ...Petit Granit is a Carboniferous grey-bluish crinoidal limestone that becomes shiny black when polished.The rock is known under several other names including Pierre bleue(Blue stone),but it should not be confused with other natural stones having a similar commercial name,which are superficially similar limestones.It consists of around 96%microcrystalline calcite and a high proportion of fossils,mainly crinoids.In addition some dolomite,quartz,pyrite,marcasite and fluorite are present.Around fifteen quarries are currently active,employing almost one thousand people and thus is an important part of the natural stone economy in Belgium.Petit Granit has an Appellation d’Origine Locale(Local Appellation of Origin)designation since 1999.It has been extracted in several regions of southern Belgium since the Middle Ages.展开更多
文摘Following the unanimous approval of the Executive Committee on the International Union of Geological Sciences as notified on April 8,2016,the Global boundary Stratotype Section and Point for the base of the Albian Stage of the Cretaceous is defined at the first occurrence datum of the planktonic foraminiferan Microhedbergella renilaevis Huber and Leckie,2011 at a level 37.4 meters above the base of the Marnes Bleues Formation and 40 cm above the base of the Niveau Kilian marker bed in the section SSE of the Col de Pré-Guittard,Arnayon,Drôme,France.The first occurrence of Microhedbergella renilaevis is placed within a 100-m section of argillaceous sediments with 28 secondary markers including calcareous nannofossils,planktonic foraminifera,an inoceramid bivalve,ammonites,stable carbon isotopes,and local marker beds.
基金sponsored by the ERASMUS Intensive Programme 2012-1-ES1-ERA10-54375 and it was done within the framework of Heritage Stone Task Group activitiesUniversity of Salamanca funding program supports this publication.
文摘Petit Granit is a Carboniferous grey-bluish crinoidal limestone that becomes shiny black when polished.The rock is known under several other names including Pierre bleue(Blue stone),but it should not be confused with other natural stones having a similar commercial name,which are superficially similar limestones.It consists of around 96%microcrystalline calcite and a high proportion of fossils,mainly crinoids.In addition some dolomite,quartz,pyrite,marcasite and fluorite are present.Around fifteen quarries are currently active,employing almost one thousand people and thus is an important part of the natural stone economy in Belgium.Petit Granit has an Appellation d’Origine Locale(Local Appellation of Origin)designation since 1999.It has been extracted in several regions of southern Belgium since the Middle Ages.
