46 
BOULDERS IN NORTH HERTFORDSHIRE. 
*132. Rounded, worn pebble. Sandy limestone : probably Jurassic. 9in. by 
7|in. by 5|in. 
*135. Worn, smoothed, broken slab, slightly scratched. Limestone, with fossils : 
probably Jurassic. 7in. by 7in. by 2in. 
*136. Rough, broken pebble. Limestone, with fossils: Jurassic. 4in. by 4in. 
by 3in. 
*137. .Broken piece, much rounded on original surface; apparently a piece of a 
nearly spherical boulder; a few scratches and grooves. Limestone : 
probably Jurassic. 9in. by 6in. by 3|in. 
*140. Triangular, broken fragment; one face well smoothed, and scratched and 
grooved in various directions. Limestone : probably Jurassic. BJin. 
by 7in. by 2in. 
*142. Rough, angular slab (possibly not a boulder). Limestone, with fossils: 
probably Mesozoic. 19in. by 9in. by ? 
*143. (See List I.) 
*144. Broken, worn piece. Carboniferous Limestone. 9in. by 8in. by 6in. 
*145. Rounded, worn pebble. Yery hard, fossiliferous limestone : probably 
Lias-MarIstone. 9in. by 7in. by ? 
*146. Rough, irregularly-shaped pebble, very slightly worn. Sandy limestone : 
very like Lias-MarIstone, with Pecten (? cequivalvis). 9in. by 6in. 
by 5Jin. 
*147. Rounded, worn, flattish boulder. Fossiliferous limestone : probably 
Jurassic. 12in. by lOin. (P) by 6in. 
*153. Rounded, cuboidal block, surface rough. Calcareous mudstone, with 
Ostrcea or Gryphcea : Jurassic, very like Lias-Marlstone. 13in. by 
9^in. by ? 
*155. Flat slab, angles worn. Limestone : probably Carboniferous. lOJin. by 
lOin. by 3in. 
158. Angular slab, possibly slightly worn. Argillaceous limestone, with fossils: 
probably Lias. llin. by lOin. by 4in. 
175. Rounded, nearly spherical, smoothed. Limestone, with Serpula, etc.: 
Jurassic . 1 lin. by 8in. by 7in. 
LIST IY. 
Igneous Rochs. 
30. Yery uneven surfaces, covered with little knobs and depressions, broken on 
one side. Granite. 8 Jin. by 7in. by 5|in. 
33. Rounded and smoothed. Granite. 7in. by 5in. by P 
66. Broken, rounded pebble. Porphyrite. 4in. by 4in. by 3in. 
72. Rounded, many-sided block, surface rough and granular from exposure. 
Granite. 16in. hy 14in. by ? 
73. Smooth, worn, and rounded, shape somewhat irregular. Basalt’, weathering 
dark blue. 21in. by 18in. by 12in. 
90. Worn, somewhat prismatic in shape, angles rounded and sides flat. Dolerite. 
15in. by lOin. by 7 Jin. 
103. (See List I.) 
186. Irregularly-shaped, smoothed and worn. Dolerite. 16in. by 9in. by 8in. 
