HELP: Remarks - Parse Lithology Composition from Text

The best way to enter the other rock image data is to enter your description of the bed in the Remarks / Notes / Comments Data Entry Dialog and build a list of bed descriptions and then select the " Compute other data entry data types from Remarks" button.

This will allow the program to automatically use the geological description lookup xml files to parse your text into the rock image tracks. This basically saves time and effort, instead of entering each track separately.
A lithology / composition example "very sandy slightly argillaceous dolomitic limestone; marine abundant trilobites, echinoderm fragments, corals, few bryozoa, broken brachiopods; very pale blue (5B8/2) color with moderate blue (5B5/6) stains; pyrite nodules and concretions, erosional bed". The phrase "very sandy slightly argillaceous dolomitic limestone" will be parsed into percent "mineral" composition. Limestone is the main lithology, very sandy is a primary modifier and slightly argillaceous & dolomitic are consider a secondary modifiers. The Parse engine looks for the main lithology and then searches for any modifiers to the main lithology. The parse engine then assigns a percent value to each "mineral", as follows,
  • very sandy = 30% sand
  • slightly argillaceous = 10% clay
  • dolomitic = 20% dolomite
  • limestone = 40% limestone

Basically the main lithology starts at 100% and is reduced by the subsequent modifiers added to the description, only up to 60% descriptors are allowed. The hierarchy of percentages are as follows,
Main Lithology = 100% i.e. Sandstone >> 100% Quartz
Two Lithology 1st Lithology=60% 2nd Lithology=40%, i.e. clay shale >> 60% Clay 40% Shale
  very { lithology } = 30%, i.e. very cherty >> 30% chert
  { lithology } = 20%, i.e. cherty >> 20% chert
  slightly { lithology } = 10%, i.e. slightly cherty >> 10% chert

A list of Lithology Symbols & Background colors are stored in a Lithology XML lookup file and illustrated as follows, Lithology Symbols/Colors there are a number of sources for lithologic symbols, but for this program the bulk of the symbols use Shell Oil's 1995 Legend1 and the Federal Geographic Data Committee lithologic patterns2.



(2) Section 37 -- Lithologic Patterns FGDC (Federal Geographic Data Committee) Digital Cartographic Standard for Geologic Map Symbolization.

Author: John R. Victorine