who originated the geosynclinal theory of the structure of the earth
Geosyncline The geosyncline concept was first developed by the American geologists James Hall and James Dwight Dana in the mid-19th century during the classic studies of the Appalachian Mountains.[1][4] Émile Haug actualized the geosyncline concept and "reintroduced" it to Europe with a 1900 publication.[5][6] Eduard Suess, a leading geologist of his time, disapproved the concept of geosyncline and argued in 1909 against its use due to its associated theories.[6][7] This did not stop further development of the concept by Leopold Kober and Hans Stille in the first half of the 20th century,[8] both of whom worked on a contracting Earth framework.[8] Stille and Kober had rather similar views.[9]
Geological history of Earth The geological history of Earth follows the major events in Earth's past based on the geologic time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the Solar System.