There are about 40 cones in the Cima volcanic field.
The cones are as much as 890 metres (2,920 ft) wide and 170 metres (560 ft) high, and are concentrated between elevations of 1,400–790 metres (4,600–2,600 ft) on a south-southwest tilting slope.
Some cones are well preserved with intact craters, while others have been reduced to hills by erosion.
Some cones have more than one crater.
North of the main field lie two outcrops of older volcanic rocks (Miocene to Pliocene); other than this separate older outcrop volcanic activity appears to have occurred without any preferential alignment.
Several washes such as Willow Wash, Black Tank Wash and Indian Creek cross through the field and have eroded lava flows.

The youngest cone (35°10′53″N 115°49′1″W) in the southwestern part of the field is called Black Tank cone.
The Black Tank cone is the source of a 2-kilometre (1.2 mi) long lava flow, which at first forms a levee-bound channel and then narrows out into a lobate shape.
It also shows traces of a lava tube and has a volume of 0.015 cubic kilometres (0.0036 cu mi).
This flow may have been preceded by a previous lava flow which was later buried by the main flow.
An older vent lies just south-southwest of the Black Tank Cone.

The field presents black and red volcanic rocks in the form of cinders, exposed feeder dykes and lava bombs, as well as agglutinates which are exposed in gullies and eroded vents.
Bombs and cinders cover the less eroded cones, which are also sometimes surrounded by base surge deposits.
At some vents, tuff rings formed through phreatomagmatic activity.
Erosion has dug gullies and larger valleys in the older cones, including one 150-metre (490 ft) deep gorge.

Volcanic material covers a surface area of about 150 square kilometres (58 sq mi) within an area of c. 600 square kilometres (230 sq mi).
The volcanic field was emplaced on a basement of Tertiary age, which comprises both crystalline bedrock and thick gravel deposits.
Other rock formations in the area are of Proterozoic–Paleozoic to Mesozoic (Teutonia batholith) age, and the region is considered to be part of the Ivanpah uplift.
There are about 40 cones in the Cima volcanic field. The cones are as much as 890 metres (2,920 ft) wide and 170 metres (560 ft) high, and are concentrated between elevations of 1,400–790 metres (4,600–2,600 ft) on a south-southwest tilting slope. Some cones are well preserved with intact craters, while others have been reduced to hills by erosion. Some cones have more than one crater. North of the main field lie two outcrops of older volcanic rocks (Miocene to Pliocene); other than this separate older outcrop volcanic activity appears to have occurred without any preferential alignment. Several washes such as Willow Wash, Black Tank Wash and Indian Creek cross through the field and have eroded lava flows.
The youngest cone (35°10′53″N 115°49′1″W) in the southwestern part of the field is called Black Tank cone. The Black Tank cone is the source of a 2-kilometre (1.2 mi) long lava flow, which at first forms a levee-bound channel and then narrows out into a lobate shape. It also shows traces of a lava tube and has a volume of 0.015 cubic kilometres (0.0036 cu mi). This flow may have been preceded by a previous lava flow which was later buried by the main flow. An older vent lies just south-southwest of the Black Tank Cone.
The field presents black and red volcanic rocks in the form of cinders, exposed feeder dykes and lava bombs, as well as agglutinates which are exposed in gullies and eroded vents. Bombs and cinders cover the less eroded cones, which are also sometimes surrounded by base surge deposits. At some vents, tuff rings formed through phreatomagmatic activity. Erosion has dug gullies and larger valleys in the older cones, including one 150-metre (490 ft) deep gorge.
Volcanic material covers a surface area of about 150 square kilometres (58 sq mi) within an area of c. 600 square kilometres (230 sq mi). The volcanic field was emplaced on a basement of Tertiary age, which comprises both crystalline bedrock and thick gravel deposits. Other rock formations in the area are of Proterozoic–Paleozoic to Mesozoic (Teutonia batholith) age, and the region is considered to be part of the Ivanpah uplift.
Cima volcanic field