Pyrrhotite is a mineral found in bedrock under certain parts of Connecticut and Massachusetts. It can cause long-term structural weakness in construction when used in cement, the USGS says.

Pyrrhotite, a mineral found in bedrock under certain parts of Connecticut and Massachusetts, can cause long-term structural weakness in construction when used in cement, according to USGS.

Mapping is another critical part of the Massachusetts Geological Survey. Before he ended his 22-year term as state geologist, Mabee published a updated bedrock map of the state.

The flights will image geology as part of a national effort to modernize geological maps in the region. The planes will take measurements over a large swath of central and western Massachusetts.

Pyrrhotite is a mineral found in bedrock under certain parts of Connecticut and Massachusetts. It can cause long-term structural weakness in construction when used in cement, the USGS says.

Pyrrhotite is a mineral found in bedrock under certain parts of Connecticut and Massachusetts. It can cause long-term structural weakness in construction when used in cement, the USGS says.