The Royal River has an average discharge of 7.7 cu ra/sec with maximum 

 recorded discharge over 300 cu m/sec. The Presumpscot River drains 1,528 km^ 

 and has an average discharge of about 25 cu m/sec and maximum flows exceeding 

 350 cu m/sec. The Fore River has extreme discharges of about 33 cu m/sec 

 (U.S.G.S., 1978). 



Groundwater data for Region 1 is sparse, but Caswell (1978) indicates 

 that bedrock well yields can exceed 100 gpm in bedrock aquifers which coincide 

 with regional bedrock faults. One apparent aquifer is a zone paralleling the 

 Nonesuch Fault running northeast - southwest along the inner margin of Casco 

 Bay and extending through the town of Freeport. 



Gerber (1979) estimates a surface aquifer recharge rate of about 31.2 

 liters/sec/km2 of exposed aquifer surface with 60% of this water transmitted 

 through the aquifer and 40% being contributed to the bedrock groundwater. 



Regions 2 and 3 (Cape Small to Port Clyde) 



Bedrock Geology: 



The bedrock geology of this region is exemplified by folded metamorphozed 

 lithologies with a structural trend oriented north - south. The region is 

 therefore dominated by north - south trending ridges, forming long peninsulas 

 along topographic lows and may structually control the position of the coastal 

 embayments. 



The bedrock lithology of this region is less well known than that of 

 Region 1, but contains many of the same units (Hussey and Pankiwskyj , 1975). 

 The Casco Bay Group of Cambro - Ordovician Age underlies most of the coastal 

 peninsulas but are replaced by different formations of equivalent age to 

 the coast. The Friendship area is characterized more by non-rusty schists and 

 gneisses and a metamorphorized volcanic (amphibolite) . An Early Devonian sill 

 (basalt) occurs along the coast and inland to the west of the Damariscotta 

 River . 



The bedrock terrain of the region is intruded locally by granites with 

 the eastern interior underlain by extensive granitic rocks. The western 

 peninsulas (Friendship and St. George) are locally intruded by gabbros and 

 diorites, and the outer islands (Monhegan I., Matana I.) are composed of 

 hornblende gabbros. 



Along the western margin of the region, in Union and Thomaston, a marble 

 crops out and has been mined historically for agricultural lime and for cement 

 lime. Pegmatite lenses and pods occur inland marginal to granitic intrusions. 

 These pegmatites have been mined principally for feldspar and mica during 

 World War II, but are still picked over by amateur gemologists seeking quartz, 

 beryl and touirmaline. 



(Continued) 

 2-D-3 



10-80 



