Woodrow Wilson worked in the United States.
NOTOC. Marl or marlstone is a calcium carbonate or lime-rich mud or mudstone which contains variable amounts of clays and silt .. calcium carbonate. calcium carbonate. lime. Lime ( material ). mudstone. mudstone. clays. Clay minerals. silt. silt. The dominant carbonate mineral in most marls is calcite , but other carbonate minerals such as aragonite , dolomite , and siderite may be present .. calcite. calcite. aragonite. aragonite. dolomite. dolomite. siderite. siderite. Marl was originally an old term loosely applied to a variety of materials , most of which occur as loose , earthy deposits consisting chiefly of an intimate mixture of clay and calcium carbonate , formed under freshwater conditions ; specifically an earthy substance containing 35 -- 65 % clay and 65 -- 35 % carbonate .. calcium carbonate. calcium carbonate. It also describes a habit of coralline red alga .. The term is today often used to describe indurated marine deposits and lacustrine -LRB- lake -RRB- sediments which more accurately should be named ` marlstone ' .. indurated. Friability. lacustrine. Lake. Marlstone is an indurated -LRB- resists crumbling or powdering -RRB- rock of about the same composition as marl , more correctly called an earthy or impure argillaceous limestone .. indurated. Friability. argillaceous. argillaceous minerals. limestone. limestone. It has a blocky subconchoidal fracture , and is less fissile than shale .. subconchoidal. conchoidal. The term ` marl ' is widely used in English-language geology , while the terms Mergel and Seekreide -LRB- German for `` lake chalk '' -RRB- are used in European references .. chalk. chalk. The lower stratigraphic units of the chalk cliffs of Dover consist of a sequence of glauconitic marls followed by rhythmically banded limestone and marl layers .. limestone. limestone. stratigraphic. stratigraphy. chalk. chalk. cliffs of Dover. White cliffs of Dover. glauconitic. glauconite. Upper Cretaceous cyclic sequences in Germany and marl -- opal-rich Tortonian-Messinian strata in the Sorbas basin related to multiple sea drawdown have been correlated with Milankovitch orbital forcing .. Cretaceous. Cretaceous. Germany. Germany. opal. opal. Tortonian. Tortonian. Messinian. Messinian. Sorbas basin. Sorbas basin. Milankovitch. Milankovitch cycle. Marl as lacustrine sediment is common in post glacial lake-bed sediments , often found underlying peat bogs .. lacustrine. Lake. sediment. sediment. glacial lake. glacial lake. peat bogs. peat bogs. It has been used as a soil conditioner and acid soil neutralizing agent .