Cryptic (geology)
The Cryptic era is an informal term for the earliest geologic evolution of the Earth and Moon. It is the oldest (informal) era of the Hadean eon, and it is commonly accepted to have begun close to 4533 million (about 4.533 billion) years ago when the Earth and Moon formed. No samples exist to date the transition between the Cryptic era and the following Basin Groups era for the Moon (see also Pre-Nectarian), though sometimes it is stated that this era ended 4150 million years ago for one or both of these bodies. Neither this time period, nor any other Hadean subdivision, has been officially recognized by the International Commission on Stratigraphy.
List of National Treasures of Japan (temples)
The early Heian period (9th–10th century) saw an evolution of style based on the esoteric sects Tendai and Shingon, which were situated in mountainous areas. A new style termed emerged with the following characteristics: a main hall divided in two parts; an outer area for novices and an inner area for initiates; a hip-and-gable roof that covered both areas; a raised wooden floor instead of the tile or stone floors of earlier temples; extended eaves to cover the front steps; shingles or bark rather than tile roofing; and an adaption to the natural environment in contrast to symmetrical layouts. The tahōtō, a two-storied tower with a resemblance to Indian stupas was also introduced by these sects during the Heian period. According to an ancient Buddhist prophecy, the world would enter a dark period in 1051. During this period the Tendai sect believed enlightenment was possible only by the veneration of Amida Buddha. Consequently, Paradise or Amida Halls—such as the Phoenix Hall at Byōdō-in (1053), the main hall of
Jōruri-ji (1157) or the Golden Hall at Chūson-ji (1124)—were built by the imperial family or members of the aristocracy to recreate the western paradise of Amida on earth. 
Halls that enshrined the nine statues of Amida were popular during the 12th century in the late Heian period. The main hall of Jōruri-ji is the only extant example of these halls.