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The birds' bones are very fragile and tend to break down before they fossilize.
a fossilizing process in which wood is gradually replaced by silica
The dark contrast of the fossilized cell walls suggests that a light element (low atomic number), perhaps carbon, is still present.
However, this technique only provides an external morphological description of putative fossilized cells and is incapable of distinguishing between abiotic fossils of similar morphologies.
These methods, especially in relation to the theory of frames, have imported a new interest into a subject which was in danger of becoming fossilized.
The resulting structures (stromatolites) often undergo only moderate diagenesis and fossilize with characteristic biofabrics.
In the case of fossilized, older, adult learners this may be true.
It is quite impossible, then, to give a principled reason why one part of the cluster would fossilize and another would not.
The mat-forming microorganisms were healthy when fossilized (by silicification) and showed no morphological signs of stress.
The prediction, then, is that successful resetting is impossible, and the interlanguage grammar of every learner will fossilize at the nontargetlike value.
Close morphological resemblance to contemporaneous microorganisms and other fossilized microorganisms further support that interpretation.
In such a situation the tendency for it to fossilize into ritualized officialese is increased because the countervailing influences of less formal varieties of the language are not so strong.
Also, it cannot be ruled out that this first planktonic stage did not possess a calcified exoskeleton, which may explain why it has not been fossilized.
We cannot unequivocally eliminate an ancient origin because the chemical signatures are similar to those of the fossil substrates, raising the possibility that they were fossilized together.
The length of the present test section is not sufficient to reach the fossilized state and the data can support no firm conclusions with respect to a fully fossilized turbulence.
It will be important below that the phonological environment in which the ex-process occurred (its 'structural description') is also fossilized, as the 'exceptions' to a change.
When the conditions of acquisition are less advantageous, the learner language is likely to fossilize at a lower level of proficiency, which is often the basic variety.
