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The possibility to predict ecological consequences in soil by the use of bioassays is evaluated in soil mesocosms . They are slightly younger than the chondrites and comprised of iron , stone or a combination of both . The response must be filed within 8 days after service of the motion unless the court shortens or extends the time . Currently , it is not clear whether the pithouses we have identified , which lack stone in their construction , represent an earlier house form at Buried City or were used contemporaneously with the larger surface stone structures . The amendment permits , but does not require , courts of appeals to adopt local rules that allow filing of papers by electronic means . Previous archaeological research at the site began in the early 1900s and has concentrated on the excavation of large surface structures with stone foundations of Middle Ceramic age . Chondrites are stone meteorites and contain calcium and aluminium-rich inclusions ( CAIs ) , which are the oldest of all planetary materials , formed very soon after the initial collapse of the solar nebula . Iron meteorites are almost entirely metallic iron with several weight percent nickel ( e.g ., Henbury ) , whilst some are mixtures of stone and metal ( e.g ., Krasnojarsk ) . The text of Rule 4 ( a ) ( 5 ) ( A ) does not distinguish between motions filed prior to the expiration of the original deadline and those filed after the expiration of the original deadline .