Weaver explained that Hamaker was convinced that humanity was rushing into the next glacial period due to carbon dioxide build-up after the normal interglacial soil demineralization and retrogressive vegetational succession, as summarized by Johannes Iversen and Svend Andersen, State Geologists from Denmark in the book " The Holocene " by Neil Roberts.
32.
A typical regional gradsect for example may be constructed according to a "'primary climate gradient "'( temperature, moisture, seasonality ) then a "'secondary gradient "'( geomorphology, lithology, major and minor drainage systems ), a "'tertiary gradient "'possibly represented by a local soil catena or local land use farming system or finer scale gradient levels representing local vegetational sequences.
33.
By comparing the Plomin tablet figure with the remains of fresco from the ruinous church of Saint George near Vrbnik on the island of Krk, where this saint is portrayed not with one vegetational attribute but with two ( holding one in each hand ), Fu i has interpreted this unusual, exceptional iconography as a contamination of the perception of Saint George the martyr ( holding a palm in his hand ) with a perception of Croatian folk " green George " ( Croatian : " zeleni Juraj " ) which carries spring greenery in his hand.
