.2
    Areas where deposits are likely to contain sand and gravel 
    with properties that will meet most uses.

.3
    Areas where deposits are likely to contain sand and gravel 
    with properties that may not meet some uses, or may meet
    uses only with extensive processing.



Potential sources of crushed stone aggregate are identified 
according to both physical and chemical properties.  The colors 
of the map units reflect the likely physical property. The 
darkness of the map colors reflects the likely chemical quality.

.78
    Most of area likely to contain potential sources of crushed 
    stone aggregate of satisfactory physical quality, and innocuous 
    chemical quality.  May include small areas of fair or poor
    quality aggregate, and (or) deleterious chemical quality aggregate.

.77
    Most of area likely to contain potential sources of crushed 
    stone aggregate of satisfactory physical quality, and deleterious 
    chemical quality.  May contain small areas of fair or poor quality 
    aggregate, and (or) innocuous chemical quality aggregate.

.65
    Most of area likely to contain potential sources of crushed stone 
    aggregate of fair physical quality, and of innocuous chemical 
    quality.  May contain small areas of satisfactory or poor quality 
    aggregate, and (or) deleterious chemical quality aggregate.

.18
    Most of area likely to contain potential sources of crushed stone 
    aggregate of fair physical quality, and deleterious chemical 
    quality.  May contain small areas of satisfactory or poor quality 
    aggregate, and (or) innocuous chemical quality aggregate.

.59
    Most of area likely to contain potential sources of crushed stone 
    aggregate of poor physical quality, and innocuous chemical quality.  
    May contain small areas of satisfactory or fair quality aggregate, 
    and (or) deleterious chemical quality aggregate.

.58
    Most of area likely to contain potential sources of crushed stone 
    aggregate of poor physical quality, and deleterious chemical quality.  
    May contain small areas of satisfactory or fair quality aggregate, 
    and (or) innocuous chemical quality aggregate.



Some areas shown on the map are not commonly used as aggregate.

.6
    Most of area likely to contain potential sources of crushed stone 
    aggregate of mixed physical quality, and of mixed chemical quality. 

.15
    Materials in area may have value as other industrial minerals such 
    as dimension stone, brick clay, fire clay, sand, or cement. 

.40
    Materials commonly do not contain enough coarse materials for use 
    as aggregate.



Bedrock may be fractured near geologic faults (thick black lines).  
This may facilitate aggregate production by reducing the blasting 
requirements.  On the other hand, the rock may be excessively 
fractured.  Fractured pieces of rock have a lower compressive strength 
than non-fractures rock. Therefore, when using this map to evaluate 
aggregate resources, aggregate that is shown near faults may be of 
different quality than indicated.