Glossary

From Pilbara

Jump to: navigation, search


A

Amplitude: Height


C

Clastic succession: Rocks made of detritus

Conglomerate: Boulders and cobbles cemented together

Cross-sectional: As if cut across


D

Detrital clastic grains: Sand and bigger bits of rock


F

Ferruginous: Iron-bearing

Fold structures: Where the sedimentary and other layers have been squashed and bent by later pressure

Foliated: With layers resulting from later alteration and pressure


H

Hydrothermally altered: Where very hot waters have passed and changed the composition


L

Laminae: Very thin layers


M

Mineral precipitate crust: Rock resulting from chemical deposition


O

Ocelli: Spheroidal structures that form in volcanic rocks


P

Penetrative fabric: Where layers formed by pressure and heat cut across older structures

Platey: Breaks into sheets of rocks

Precipitative cones: Conical stromatolite-like structures perhaps formed without microbes

Pillow basalts: Volcanic lava that flowed under water, cooled quickly, and formed mounds that look like pillows

Pyrophylite: A mineral made of aluminiunm and silicon


S

Silica: Oxidised silicon: SiO2

Schisty: Similar to foliated

Subaeriel: Under the atmosphere. Soil is an example


U

Unconformity: Where a much older rock is overlain by one much younger


V

Vitrification: Where some process has made a glass-like rock


Contents


Introduction

Context

Early Life

Evidence

Acknowledgements

Personal tools