------------------------------------+------------------------------------ FACTS OBSERVED. | THEORETICAL VIEWS. -------------------+----------------+------------------------------------ Inland Plains. | Marginal Areas.|Glacial Theories.| Floating Ice | | | Theories. ===================+================+==================================== Terraces. | Terraces and | Emergence of Modern Land.[AJ] | Raised Beaches.| -------------------+----------------+------------------------------------ Travelled Boulders |Sand and Gravel,| and Glaciated |with Sea Shells | Stones and Rocks |and Boulders. | Shallow Sea and Floating Ice. Stratified Sand | | and Gravel. | | -------------------+----------------+------------------------------------ Stratified Clay |Stratified Clay | Deep Sea and Floating Ice. with Drift Wood, |with Sea Shells.+----------------+------------------- and a few Stones. |Boulder Clay |Submergence of |Much floating Ice and Boulders. |with or without |the land. Great |and local Glaciers. Striated Rocks. |Sea Shells. |continental |Submergence of |Striated Rocks. |mantle of Ice. |Pliocene Land. -------------------+----------------+----------------+------------------- Old channels, |Old channels, |Erosion by |Erosion by indicating a higher|etc., indicating|continental |atmospheric level of the land. |previous dry |Glacier. |agencies and |land. | |accumulation of | | |decomposed rock. -------------------+----------------+----------------+------------------- [AJ] The phenomena of this period, with reference to rainfall, melting snows, and valley deposits, must be noticed in the next chapter.