The phrase "amassed into a" is correct and usable in written English.
It can be used when describing the act of gathering or collecting items or information into a specific form or structure.
Example: "The data was amassed into a comprehensive report that highlighted the key findings of the research."
Alternatives: "collected into a" or "gathered into a".
Hoarith said nothing, only swept the pile of rust flakes that he amassed into a knothole in the floor.
It was the essence of totalitarianism, the Court found, for personal information about someone to be collected and amassed into a personal profile without the person's knowledge.
For the final two-year stage of her project, Krug assembled the material she had amassed into a sprawling family album.
By 1990, when Daniels became mayor, crime was at an all-time high, tax delinquency was out of control, and labor contracts amassed into a full-on budgetary crisis.
Thousands of red crabs had amassed into a swarm and began scuttling along the seafloor, kicking up a 30-foot-high cloud of mud in their wake.
The data that battery companies sent to the E.P.A. about exports consisted of "piles of paper," Mr. Lloyd said, and it was never amassed into an electronic database that would be "useful to regulators".
Lowe, who was giving me a tour of the workshop, explained that the della Quercia replicas had been made with a 3-D printer a device that expels pixel-size globules of synthetic resin, which harden and amass into a complex shape.
But let's face it, I live with three teenagers, who are not always the kindest people in the world, and whose brains sometimes amass into a flurry of hormone-controlled impulses that can make for stressful times.
Suspended from 36 motorized rollers which move along the contours of a massive steel cam to create their wavelike movement, after Breaking Wave's 804 spheres rise and fall, the spheres amass into a disordered form loosely resembling electrons in an electron cloud.
The collection of edgelands and nowheres amass into an uneasy unity that doesn't really exist, and never really could.
Most incidents involved small groups of rioters who were quickly dispersed before they could amass into larger groups.
