The phrase "a steep base" is correct and usable in written English.
It can be used in contexts such as describing a physical structure, a geographical feature, or a metaphorical concept that has a strong or challenging foundation.
Example: "The mountain had a steep base that made the ascent particularly difficult for climbers."
Alternatives: "a sharp foundation" or "a high starting point".
Denizens of that venerable cowboy mountain resort take homemade craft of cardboard -- kept together by glue, string, duct tape and paint -- and use them as a vehicle for pitching themselves down a steep base-lodge slope.
The battle opened about 3 p.m., when the 900 Patriots (including John Crockett, father of Davy Crockett), approached the steep base of the western ridge.
Still, there were many soldiers like Kyle who signed up for war and paid a steep price, based on a lie perpetuated by American politicians (and still employed journalists).
The formation of higher aspect ratio island shapes can thus be considered as adding a steeper faceted base in each transition to the next hierarchical level of island shapes without changing the existing upper part, which obviously represents a very natural way of transformation of the flatter pyramids and domes to the almost hemispherical final cupola islands.
Analysts consider the price for MCA steep, based on annual operating profits of slightly more than $400 million.
This is sourced from long-term incision into lahar deposits, and acts to limit the rate of incision, creating a steep and stable base upon which active fractions are transported.
The diel horizontal pattern observed for tactic IV is strikingly similar to what was observed by Bourke et al. [27] in Lake Ledoux about one decade before our study: in both studies, individuals aggregated during the day in the same area, which is located close to a steep rocky shore (based on the comparison of Figure 4d with Figures 1, 2, 3 in [27]).
The aircraft flew high, remaining above the range of rebel heavy machine-guns, and then descended in a steep spiral onto the base.
When I reached the corner of Grand Avenue and Fifth Street, a steep intersection at the base of Bunker Hill, the way to the square was blocked by a mass of people.
At the foot of the campus, at the base of a steep hill, there was a small beach strewn with gray-and-yellow stones where he liked to eat his lunch.
The cars stopped at the base of a steep ascent.
