The Preparation of Illustrations for Reports of the United States Geological Survey: With Brief Descriptions of Processes of ReproductionRidgway, John L.
Science
The Preparation of Illustrations for Reports of the United States Geological Survey: With Brief Descriptions of Processes of Reproduction
Ridgway, John L.
Illustration of books
{ { Upper (Gulf may be used
{ { provincially).
{ Cretaceous. { Lower (Comanche and Shasta may be
{ { used provincially).
{
{ { Upper.
Mesozoic. { Jurassic. { Middle.
{ { Lower.
{
{ { Upper.
{ Triassic. { Middle.
{ { Lower.
{ { Permian.
{ { Pennsylvanian (replaces "Upper
{ Carboniferous. { Carboniferous").
{ { Mississippian (replaces "Lower
{ { Carboniferous").
{
{ { Upper.
{ Devonian. { Middle.
{ { Lower.
{
Paleozoic. { Silurian.
{
{ { Upper (Cincinnatian may be used
{ { provincially).
{ Ordovician. { Middle (Mohawkian may be used
{ { provincially).
{ { Lower.
{
{ { Saratogan (or Upper Cambrian).
{ Cambrian. { Acadian (or Middle Cambrian).
{ { Waucoban (or Lower Cambrian).
{ Algonkian. }pre-Cambrian.
Proterozoic. { Archean. }
_Chemical elements and symbols._
Element. Symbol. Element. Symbol. Element. Symbol.
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