Turner is a small lunar

Moon

The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...

 impact crater

Impact crater

In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

 that lies in the Mare Insularum

Mare Insularum

Mare Insularum is a lunar mare located in the Insularum basin just south of Mare Imbrium. The basin material is of the Lower Imbrian epoch, with the mare material of the Upper Imbrian epoch. The mare is bordered by the craters Copernicus on the east, and Kepler on the west...

, near the Moon's equator. It is located to the southeast of the crater Gambart

Gambart (crater)

Gambart is a small lunar crater on the Mare Insularum, near the central region of the Moon. It can be located to the south-southeast of the prominent ray crater Copernicus. In the past, the floor of Gambart has been flooded with lava, leaving a relatively flat surface surrounded by a smooth but...

. Turner is a circular, cone-shaped crater with inner walls that slope down to the mid-point. A similar-sized ghost crater

Palimpsest

A palimpsest is a manuscript page from a scroll or book from which the text has been scraped off and which can be used again. The word "palimpsest" comes through Latin palimpsēstus from Ancient Greek παλίμψηστος originally compounded from πάλιν and ψάω literally meaning “scraped...

 is attached to the western rim, its interior floor submerged by lava

Lava

Lava refers both to molten rock expelled by a volcano during an eruption and the resulting rock after solidification and cooling. This molten rock is formed in the interior of some planets, including Earth, and some of their satellites. When first erupted from a volcanic vent, lava is a liquid at...

and the surviving rim broken in the southwest.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Turner.

Turner	Latitude	Longitude	Diameter
A	1.1° S	14.7° W	6 km
B	0.9° S	10.6° W	5 km
C	2.4° S	12.3° W	5 km
F	1.6° S	14.1° W	7 km
H	2.8° S	13.0° W	4 km
K	3.8° S	13.4° W	4 km
L	3.4° S	12.5° W	5 km
M	4.2° S	11.8° W	4 km
N	2.9° S	12.0° W	4 km
Q	1.0° S	12.4° W	3 km