Converse of object

• strew: From boulder strewn floor many boulder mazes lead off including a ' z alley ' .

• dislodge: Large boulder dislodged from left wall partially blocking end passage half way down.

• poise: At the top, a cornice of poised boulders can be passed to a hanging ledge beneath a vast hanging choke.

• perch: I carefully hopped up onto it mindful of a load of perched boulders.

• hurl: Maybe hurling big boulders - even making them change into steaming chunks of lava on the way - is more your thing.

Adjective modifier

• jammed: First, a couple of jammed boulders jammed at head height in the passage were removed.

• calcited: This is a fairly complicated feature, which drops about 3 meters over calcited boulders.

• erratic: Samson's putting stone - a glacial erratic boulder can be seen up on the hillside to the right.

• glacial: Samson's putting stone - a glacial erratic boulder can be seen up on the hillside to the right.

• loose: At the bottom, an incline past once loose boulders leads to a second 50 foot shaft.

• rounded: Between well rounded, greasy boulders the water was deep, cold and fast.

Modifies a noun

• ruckle: A further look at Marble Hall revealed a boulder ruckle with a very large passage leading off.

• choke: Turning left at the T-junction a low passage enters an area of boulder chokes.

• clay: The cliffs change here from boulder clay to chalk.

• scree: This included climbing over boulders to get to likely areas of boulder scree, and getting onto the scree itself.

• slope: Once the dust had settled most of the boulder slope was sixty meters lower down the cave.

• pile: Here, a steep loose boulder pile must be climbed to where a huge block is jammed across the passage.

Noun used with modifier

• gritstone: The stream flows away to the left in a passage of roughly circular cross-section, having many gritstone boulders on the floor.

• granite: We saw, sitting on a vast granite boulder, a man who looked at us.

• draughting: The downstream, northern passage ends at a draughting boulder choke.