Examples of index fossils. Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages).
Methyl cellulose. Methyl cellulose (or methylcellulose) is a chemical compound derived from cellulose. It is a hydrophilic white powder in pure form and dissolves in cold (but not in hot) water, forming a clear viscous solution or gel.
Cellulose gives food âmore water, more air, a creamy feeling in [the] mouth with less of other ingredients,â and only a very small amount is needed, says Niels Thestrup, vice president of the hydrocolloids department for Danisco AS.